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Fuel cell assembly gasket for fuel containment
PATENTS
Gasket for molding plastic lens
Fuel cell assembly gasket for fuel containment
Applicant: Hoya Corporation, Japan
Applicant: Hewlett-Packard Development Co LP, USA
This patent describes a mold (1) for the production of plastic lenses that incorporates a tubular gasket (2) to surround the mold. The lens surfaces are formed by the top and bottom molds (3, 4). An elastically deformable triangular projection band (5) is integrally formed on the inner peripheral surface of the gasket. The projection band projects over the entire circumference
of the inner peripheral surface of the gasket, and is inclined upwards relative to the axis (L) of the gasket. The top mold, when pressed into the gasket, in turn presses the projection band to elastically deform it downwards. Patent number: WO 2005/042221 Inventors: S. Kadowaki and T. Kawakami Publication date: 12 May 2005
Cross-section of the molding system for plastic lenses described in WO 2005/042221, which has a tubular gasket surrounding the mold.
This patent describes a seal for proton-exchange membrane or polymer electrolyte membrane (PEM) fuel cells. It is intended to overcome problems with the use of relatively rigid, heavy flow-field plates to maintain separation between the fuel and oxidant. These plates are typically made from graphite, resin-impregnated graphite, stainless steel or titanium, and use elastomer gaskets. The plates and the gaskets are often bolted tightly together in an effort to create a seal. However, in this type of construction, problems related to crushed gas diffusion layers, diffusion limitations, and damage from contact with the flow-field plate often arise. In addition, it is often difficult to align the gaskets with a membraneelectrode assembly (MEA), and the size of the mechanical fasteners typically precludes them from being suitable for use in relatively slim applications. This construction method suffers from the disadvantage of being tedious, time-consuming and expensive. In the fuel cell described here the PEM is larger than the catalyst layers, and the
assembly has a gasket attached to the uncovered portion of the polymer electrolyte membrane. Patent number: WO 2005/045974 Inventors: L. Mittelstadt, Y. Jeon and A.I.-T. Pan Publication date: 19 May 2005
A prior-art assembly is shown in 1A, compared with the new gasket in 1B and with the current collectors attached in 1C, from WO 2005/045974.
Seal structure of door for automobile
Non-contact oil seal mechanism for rotating shaft
Applicant: Daihatsu Motor Co Ltd, Japan
Applicant: Komatsu Ltd, Japan
This patent concerns a vehicle door sealing strip, and in particular features on both the seal and the door to facilitate retention of the seal. The weather strip (22) sealing against the window (12) is installed on the upper side part (6a) of the door outer panel (6). The claws (6d) engages with the
lower end of the hook (23f ) of the weather strip to prevent it from being extracted. The additional door sections (6a, d, e) abut the weather strip to prevent lateral movement. Patent number: WO 2005/042286 Inventor: H. Iwai Publication date: 12 May 2005
This patent describes a non-contact oil seal mechanism for a rotating shaft. The rotating shaft (12) is supported in the casing (3) with a clearance. The seal mechanism comprises an oil recovery chamber (4) formed in the inner peripheral surface of the casing. A number of oil cutting grooves (5) are formed in the outer peripheral surface of the shaft in the oil recovery
chamber. The oil recovery grooves are all arranged to coincide with the oil recovery chamber. The illustrations published in this patent include diagrams showing testing with an angle of inclination on the shaft, presumably to demonstrate its effectiveness in these conditions. Patent number: WO 2005/040649 Inventors: J. Akita and T. Takahashi Publication date: 6 May 2005
The clearance seal arrangement for rotating shafts described in WO 2005/040649.
The vehicle door weather strip described in WO 2005/042286, showing the retention claws.
16
Sealing Technology July 2005
Gasket for molding plastic lens
Fuel cell assembly gasket for fuel containment
Applicant: Hoya Corporation, Japan
Applicant: Hewlett-Packard Development Co LP, USA
This patent describes a mold (1) for the production of plastic lenses that incorporates a tubular gasket (2) to surround the mold. The lens surfaces are formed by the top and bottom molds (3, 4). An elastically deformable triangular projection band (5) is integrally formed on the inner peripheral surface of the gasket. The projection band projects over the entire circumference
of the inner peripheral surface of the gasket, and is inclined upwards relative to the axis (L) of the gasket. The top mold, when pressed into the gasket, in turn presses the projection band to elastically deform it downwards. Patent number: WO 2005/042221 Inventors: S. Kadowaki and T. Kawakami Publication date: 12 May 2005
Cross-section of the molding system for plastic lenses described in WO 2005/042221, which has a tubular gasket surrounding the mold.
This patent describes a seal for proton-exchange membrane or polymer electrolyte membrane (PEM) fuel cells. It is intended to overcome problems with the use of relatively rigid, heavy flow-field plates to maintain separation between the fuel and oxidant. These plates are typically made from graphite, resin-impregnated graphite, stainless steel or titanium, and use elastomer gaskets. The plates and the gaskets are often bolted tightly together in an effort to create a seal. However, in this type of construction, problems related to crushed gas diffusion layers, diffusion limitations, and damage from contact with the flow-field plate often arise. In addition, it is often difficult to align the gaskets with a membraneelectrode assembly (MEA), and the size of the mechanical fasteners typically precludes them from being suitable for use in relatively slim applications. This construction method suffers from the disadvantage of being tedious, time-consuming and expensive. In the fuel cell described here the PEM is larger than the catalyst layers, and the
assembly has a gasket attached to the uncovered portion of the polymer electrolyte membrane. Patent number: WO 2005/045974 Inventors: L. Mittelstadt, Y. Jeon and A.I.-T. Pan Publication date: 19 May 2005
A prior-art assembly is shown in 1A, compared with the new gasket in 1B and with the current collectors attached in 1C, from WO 2005/045974.
Seal structure of door for automobile
Non-contact oil seal mechanism for rotating shaft
Applicant: Daihatsu Motor Co Ltd, Japan
Applicant: Komatsu Ltd, Japan
This patent concerns a vehicle door sealing strip, and in particular features on both the seal and the door to facilitate retention of the seal. The weather strip (22) sealing against the window (12) is installed on the upper side part (6a) of the door outer panel (6). The claws (6d) engages with the
lower end of the hook (23f ) of the weather strip to prevent it from being extracted. The additional door sections (6a, d, e) abut the weather strip to prevent lateral movement. Patent number: WO 2005/042286 Inventor: H. Iwai Publication date: 12 May 2005
This patent describes a non-contact oil seal mechanism for a rotating shaft. The rotating shaft (12) is supported in the casing (3) with a clearance. The seal mechanism comprises an oil recovery chamber (4) formed in the inner peripheral surface of the casing. A number of oil cutting grooves (5) are formed in the outer peripheral surface of the shaft in the oil recovery
chamber. The oil recovery grooves are all arranged to coincide with the oil recovery chamber. The illustrations published in this patent include diagrams showing testing with an angle of inclination on the shaft, presumably to demonstrate its effectiveness in these conditions. Patent number: WO 2005/040649 Inventors: J. Akita and T. Takahashi Publication date: 6 May 2005
The clearance seal arrangement for rotating shafts described in WO 2005/040649.
The vehicle door weather strip described in WO 2005/042286, showing the retention claws.
16
Sealing Technology July 2005