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5483338 Method and apparatus for evaluating structural weakness in polymer matrix composites
PatentsALERT
a mold and expandable epoxy matrix material is placed between the layers of the composite material either before or after closing the mold and, then, subjecting the mold and its contents to heat which activates the epoxy resins in both the composite material and the matrix material causing the matrix material to expand thereby compressing the composite material in order to produce a competent composite part.
5475052 COLLAGEN-SYNTHETIC BOLYMER MATRICES PREPARED USING A MULTIPLE STEP REACTION RheeWoonza M; Berg Richard A Palo Alto, CA, UNITED STATES assigned to Collagen Corporation The present invention discloses collagen-synthetic polymer matrices which are prepared using a multiple step reaction. The first step of the reaction generally involves reacting collagen with a functionally activated synthetic hydrophilic polymer to form a collagen-synthetic polymer matrix. The synthetic hydrophilic polymer may be mono- or multifunctionally activated, but is preferably difunctionally activated, resulting in the formation of a crosslinked collagen matrix. The second step comprises modifying the collagen-synthetic polymer matrix according to one or more of the following methods: further crosslinking the matrix using a multifunctionally activated synthetic polymer, conjugating the matrix using a monofunctionally activated synthetic polymer, coupling biologically active molecules or glycosaminoglycans to the matrix, crosslinking the matrix using conventional chemical crosslinking agents, or modifying the collagen in the matrix by means of various chemical reactions. An optional third step may include further modification of the collagen-synthetic polymer matrix by covalently binding, for example,biologically active molecules or glycosaminoglycans to the matrix by means of available active groups on the synthetic hydrophilic polymers. Collagen-synthetic polymer matrices prepared according to the methods of the present invention have very low immunogenicity and can therefore be used to prepare biocompatible implants for use in a variety of medical applications.
5476704 PLASTIC-COMPOSITE PROFILED GIRDER, IN PARTICULAR A WING SPAR FOR AIRCRAFT AND FOR WIND-TURBINE ROTORS Kohler Dieter Wiener Neustadt, AUSTRIA assigned to Hoac-Austria Flugzeugwerk Wr Neustadt Gesellschaft mbH
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PCT No. PCT/AT93/00108 Sec. 371 Date Feb. 10, 1994 Sec. 102(e) Date Feb. 10, 1994 PCT Filed Jun. 30, 1993 PCT Pub. No. WO94/01271 PCT Pub. Date Jan. 20, 1994. Synthetic resin composite profile, in particular wing spar for aircraft construction, comprising at least two flanges provided with adhesive bonding flanges and at least one web interconnecting the flanges and inserted into the adhesive bonded flanges, the flanges being constructed of resin impregnated rovings and the web of resin impregnated woven or non-woven fabrics and the flanges and the web being adhesively interconnected. The flanges are pultruded, the web being inserted into the adhesive bonding flanges of both flanges and fixed therein by means of a thixotropic adhesive. This manner of construction ensures that the full flange adhesive bonding width is retained even if the component height should change.
5482774 COMPOSITE PREPEG AND TENNIS RACKETS USING THE SAME Miyamoto Kenich; Minamiguchi Haruyoshi Akashi, JAPAN assigned to Sumitomo Rubber Industries Ltd A composite prepreg for producing a tennis racket, which is light and tough and superior in flexibility and vibration absorption abilities, comprises thermosetting resin and reinforcing fibers, wherein the reinforcing fibers are a combination of (a) aromatic polyamide’ or polyester fibers and (b) carbon fibers, the fibers (a) being formed into a first type of strand and the fibers (b) being formed into a second type of strand, the first and second types of strand being arranged with certain regularity. The present invention is also directed to a tennis racket comprising a circular frame constituting a ball hitting area and a shaft connecting with the circular frame, the frame and shaft having a plurality of layers structured so that at least one layer is formed from the above described composite prepreg.
5483338 METHOD AND APPARATUS FOR EVALUATING STRUCTURAL WEAKNESS IN POLYMER MATRIX COMPOSITES Wachter Eric A; Fisher Walter G Oak Ridge, TN, UNITED STATES assigned to Martin Marietta Energy Systems Inc A method and apparatus for evaluating structural weaknesses in polymer matrix composites is described. An object to be studied is illuminated with laser radiation and fluorescence emanating therefrom is collected and
PatentSALERT
filtered. The fluorescence is then imaged and the image is studied to determine fluorescence intensity over the surface of the object being studied and the wavelength of maximum fluorescent intensity. Such images provide a map of the structural integrity of the part being studied and weaknesses, particularly weaknesses created by exposure of the object to heat, are readily visible in the image.
have been applied. One then calculates the projected failure load in response to the deflection calculated to occur in response to the rated load at each station to determine if the actual loading to be applied to the pole in relation to the projected failure load at that station is acceptable. The acceptable stress is modified by a binary chopping routine until the relation of the projected failure load and the rated load differ by an acceptable amount. All tests are recalculated until no further changes are require. The pole may then be laid up on a mandrel, and the resin cured to complete the pole.
5484642 TEXTILE MATERIAL USEFUL FOR PRODUCING COMPOSITE LAMINATED ARTICLES BY INJECTION MOLDING Bompard Bruno; Aucagne Jean; Lapresle Bernar Lyon, FRANCE assigned to Brochier S A Textile reinforcing material useful for producing composite laminated articles by a general injection-molding technique, which is fabricated by arranging a stack of layers having textile reinforcements in a mold of a shape corresponding to that of the article to be fabricated and, after the mold has been closed, injecting a resin into it. At least one layer of the stack of textile reinforcements has a structure in which ducts extend in at least one direction therein to facilitate the flow of the resin during injection.
5512368 FIBERS REINFORCED WITH INORGANIC WHISKERS Harmer Mark A; Phillips Brian R Wilmington, DE, UNITED STATES assigned to E I Du Pont de Nemours and Company Disclosed herein are organic polymeric fibers containing inorganic whiskers. The fibers are made from polymers which are anisotropic. Such polymers include, for example, certain aramids and polybenzobisthiazoles. The physical properties of the fibers are improved, and are useful, for example, in ropes and composites.
5492579
5512372
METHOD FOR MAKING COMPOSITE UTILITY POLE
EPOXY RESIN COMPOSITION AND APPLICATIONS, IN PARTICULAR IN COMPOSITE STRUCTURES, USING IMIDAZOLE/POLYAMINE MIXTURE
Hosford Gregory S; Boozer John F; Pollard Robert A; Lewis John Columbia, SC, UNITED STATES assigned to Shakespeare Company A hollow, tapered, fiber-reinforced plastic utility pole, and a method for making the pole. The pole is designed by a computer-modelling technique that simulates applying resin-coated, reinforcing strands over the outer surface of a mandrel. A plurality of test stations are incrementally spaced from the tip portion to the butt portion of the pole simulated on the mandrel. The thickess-to-diameter ratio must be equal to or greater than an established constant at each station or additional circuits of resin-coated, reinforcing strands deemed to have been applied, as required. One then calculates the stress resistance at each successive station to determine if the acceptable stress is greater than the stress resistance required. Whatever additional circuits of resin-coated, reinforcing strands are necessary are then deemed to
Blanc Isabelle; Eyriey Francois; Gambert Xavier Lyon, FRANCE assigned to Brochier S A PCT No. PCT/FR93/00032 Sec. 371 Date Aug. 24, 1994 Sec. 102(e) Date Aug. 24, 1994 PCT Filed Jan. 13, 1993 PCT Pub. No. WO93/14136 PCT Pub. Date Jul. 22, 1993. Hardenable or polymerizable epoxy resin-based composition, characterized in that its hardener system comprises a combination in synergic quantities of: (i) at least one imidazole which, alone, can cause the polymerization of the epoxy resin only at a temperature above about 75 degrees C., (ii) at least one polyamine compound which, alone, leads to the polymerization of the epoxy resin at a temperature lower than about 75 degrees C. Such a resin is particularly suitable for the manufacture of composite structures, applicable in particular in ship- or boatbuilding.
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a mold and expandable epoxy matrix material is placed between the layers of the composite material either before or after closing the mold and, then, subjecting the mold and its contents to heat which activates the epoxy resins in both the composite material and the matrix material causing the matrix material to expand thereby compressing the composite material in order to produce a competent composite part.
5475052 COLLAGEN-SYNTHETIC BOLYMER MATRICES PREPARED USING A MULTIPLE STEP REACTION RheeWoonza M; Berg Richard A Palo Alto, CA, UNITED STATES assigned to Collagen Corporation The present invention discloses collagen-synthetic polymer matrices which are prepared using a multiple step reaction. The first step of the reaction generally involves reacting collagen with a functionally activated synthetic hydrophilic polymer to form a collagen-synthetic polymer matrix. The synthetic hydrophilic polymer may be mono- or multifunctionally activated, but is preferably difunctionally activated, resulting in the formation of a crosslinked collagen matrix. The second step comprises modifying the collagen-synthetic polymer matrix according to one or more of the following methods: further crosslinking the matrix using a multifunctionally activated synthetic polymer, conjugating the matrix using a monofunctionally activated synthetic polymer, coupling biologically active molecules or glycosaminoglycans to the matrix, crosslinking the matrix using conventional chemical crosslinking agents, or modifying the collagen in the matrix by means of various chemical reactions. An optional third step may include further modification of the collagen-synthetic polymer matrix by covalently binding, for example,biologically active molecules or glycosaminoglycans to the matrix by means of available active groups on the synthetic hydrophilic polymers. Collagen-synthetic polymer matrices prepared according to the methods of the present invention have very low immunogenicity and can therefore be used to prepare biocompatible implants for use in a variety of medical applications.
5476704 PLASTIC-COMPOSITE PROFILED GIRDER, IN PARTICULAR A WING SPAR FOR AIRCRAFT AND FOR WIND-TURBINE ROTORS Kohler Dieter Wiener Neustadt, AUSTRIA assigned to Hoac-Austria Flugzeugwerk Wr Neustadt Gesellschaft mbH
1112
PCT No. PCT/AT93/00108 Sec. 371 Date Feb. 10, 1994 Sec. 102(e) Date Feb. 10, 1994 PCT Filed Jun. 30, 1993 PCT Pub. No. WO94/01271 PCT Pub. Date Jan. 20, 1994. Synthetic resin composite profile, in particular wing spar for aircraft construction, comprising at least two flanges provided with adhesive bonding flanges and at least one web interconnecting the flanges and inserted into the adhesive bonded flanges, the flanges being constructed of resin impregnated rovings and the web of resin impregnated woven or non-woven fabrics and the flanges and the web being adhesively interconnected. The flanges are pultruded, the web being inserted into the adhesive bonding flanges of both flanges and fixed therein by means of a thixotropic adhesive. This manner of construction ensures that the full flange adhesive bonding width is retained even if the component height should change.
5482774 COMPOSITE PREPEG AND TENNIS RACKETS USING THE SAME Miyamoto Kenich; Minamiguchi Haruyoshi Akashi, JAPAN assigned to Sumitomo Rubber Industries Ltd A composite prepreg for producing a tennis racket, which is light and tough and superior in flexibility and vibration absorption abilities, comprises thermosetting resin and reinforcing fibers, wherein the reinforcing fibers are a combination of (a) aromatic polyamide’ or polyester fibers and (b) carbon fibers, the fibers (a) being formed into a first type of strand and the fibers (b) being formed into a second type of strand, the first and second types of strand being arranged with certain regularity. The present invention is also directed to a tennis racket comprising a circular frame constituting a ball hitting area and a shaft connecting with the circular frame, the frame and shaft having a plurality of layers structured so that at least one layer is formed from the above described composite prepreg.
5483338 METHOD AND APPARATUS FOR EVALUATING STRUCTURAL WEAKNESS IN POLYMER MATRIX COMPOSITES Wachter Eric A; Fisher Walter G Oak Ridge, TN, UNITED STATES assigned to Martin Marietta Energy Systems Inc A method and apparatus for evaluating structural weaknesses in polymer matrix composites is described. An object to be studied is illuminated with laser radiation and fluorescence emanating therefrom is collected and
PatentSALERT
filtered. The fluorescence is then imaged and the image is studied to determine fluorescence intensity over the surface of the object being studied and the wavelength of maximum fluorescent intensity. Such images provide a map of the structural integrity of the part being studied and weaknesses, particularly weaknesses created by exposure of the object to heat, are readily visible in the image.
have been applied. One then calculates the projected failure load in response to the deflection calculated to occur in response to the rated load at each station to determine if the actual loading to be applied to the pole in relation to the projected failure load at that station is acceptable. The acceptable stress is modified by a binary chopping routine until the relation of the projected failure load and the rated load differ by an acceptable amount. All tests are recalculated until no further changes are require. The pole may then be laid up on a mandrel, and the resin cured to complete the pole.
5484642 TEXTILE MATERIAL USEFUL FOR PRODUCING COMPOSITE LAMINATED ARTICLES BY INJECTION MOLDING Bompard Bruno; Aucagne Jean; Lapresle Bernar Lyon, FRANCE assigned to Brochier S A Textile reinforcing material useful for producing composite laminated articles by a general injection-molding technique, which is fabricated by arranging a stack of layers having textile reinforcements in a mold of a shape corresponding to that of the article to be fabricated and, after the mold has been closed, injecting a resin into it. At least one layer of the stack of textile reinforcements has a structure in which ducts extend in at least one direction therein to facilitate the flow of the resin during injection.
5512368 FIBERS REINFORCED WITH INORGANIC WHISKERS Harmer Mark A; Phillips Brian R Wilmington, DE, UNITED STATES assigned to E I Du Pont de Nemours and Company Disclosed herein are organic polymeric fibers containing inorganic whiskers. The fibers are made from polymers which are anisotropic. Such polymers include, for example, certain aramids and polybenzobisthiazoles. The physical properties of the fibers are improved, and are useful, for example, in ropes and composites.
5492579
5512372
METHOD FOR MAKING COMPOSITE UTILITY POLE
EPOXY RESIN COMPOSITION AND APPLICATIONS, IN PARTICULAR IN COMPOSITE STRUCTURES, USING IMIDAZOLE/POLYAMINE MIXTURE
Hosford Gregory S; Boozer John F; Pollard Robert A; Lewis John Columbia, SC, UNITED STATES assigned to Shakespeare Company A hollow, tapered, fiber-reinforced plastic utility pole, and a method for making the pole. The pole is designed by a computer-modelling technique that simulates applying resin-coated, reinforcing strands over the outer surface of a mandrel. A plurality of test stations are incrementally spaced from the tip portion to the butt portion of the pole simulated on the mandrel. The thickess-to-diameter ratio must be equal to or greater than an established constant at each station or additional circuits of resin-coated, reinforcing strands deemed to have been applied, as required. One then calculates the stress resistance at each successive station to determine if the acceptable stress is greater than the stress resistance required. Whatever additional circuits of resin-coated, reinforcing strands are necessary are then deemed to
Blanc Isabelle; Eyriey Francois; Gambert Xavier Lyon, FRANCE assigned to Brochier S A PCT No. PCT/FR93/00032 Sec. 371 Date Aug. 24, 1994 Sec. 102(e) Date Aug. 24, 1994 PCT Filed Jan. 13, 1993 PCT Pub. No. WO93/14136 PCT Pub. Date Jul. 22, 1993. Hardenable or polymerizable epoxy resin-based composition, characterized in that its hardener system comprises a combination in synergic quantities of: (i) at least one imidazole which, alone, can cause the polymerization of the epoxy resin only at a temperature above about 75 degrees C., (ii) at least one polyamine compound which, alone, leads to the polymerization of the epoxy resin at a temperature lower than about 75 degrees C. Such a resin is particularly suitable for the manufacture of composite structures, applicable in particular in ship- or boatbuilding.
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