US4522895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer fuel cell electrode substrate having elongated holes for feeding reactant gases
Assignee: Kureha Corp
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Filing: 1983-09-26
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Granted: 1985-06-11
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Expires: 2003-09-26
Abstract
Abstract A carbonaceous multilayer electrode substrate for a fuel cell disclosed herein has elongated holes for feeding reactant gases to the fuel cell. The electrode substrate comprises at least one porous carbonaceous layer having such holes. An electrode substrate of the invention comprises such a porous layer and a dense layer capable of effecting a function as a separator sheet. An another substrate of the invention comprises a dense layer and two such porous layers on both surfaces of the dense layer. A still another substrate comprises an extended dense layer and two such porous layers on both surfaces of the dense layer.
Inventors
- 👤 Masatomo Shigeta
- 👤 Hiroyuki Fukuda
- 👤 Kuniyuki Saitoh
- 👤 Hisatsugu Kaji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:20
CPC Classifications
B; B32; B32B; B32B18/00; C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B35/80; C04B35/83; C04B38/00; C04B38/0022; H; H01; H01M; H01M4/00; H01M4/86; H01M4/96; H01M8/00; H01M8/24; H01M8/2465; H01M8/2484; H01M8/2485; C04B2111/00; C04B2111/00474; C04B2111/00612; C04B2111/00853; C04B2235/00; C04B2235/02; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/524; C04B2235/5248; C04B2235/5264; C04B2235/60; C04B2235/604; C04B2235/70; C04B2235/74; C04B2235/77; C04B2237/00; C04B2237/30; C04B2237/32; C04B2237/36; C04B2237/363; C04B2237/38; C04B2237/50; C04B2237/62; C04B2237/70; C04B2237/704; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
141 words
A carbonaceous electrode substrate for a fuel cell, comprising: a dense layer having an average bulk density of not less than 1.0 g/cm 3 and a specific gas permeability of not more than 0.2 ml/cm. hr. mmAq; a porous layer of a uniformly porous carbonaceous material having an average bulk density of not less than 1.0 g/cm 3 and a specific gas permeability; of 0.3-1.0 g/cm 3 and a specific gas permeability of not less than 20 ml/cm. hr. mmAq; the thickness of said dense layer being not more than half of the thickness of said electrode substrate; a plurality of holes extending between two parallel sides of said porous layer and parallel to the surface of said electrode substrate, said holes being provided near the center of the thickness direction of said porous layer and having a circular cross section.
Claim 2
Dependent Claim
141 words
A carbonaceous electrode substrate for a fuel cell, comprising: a dense layer having an average bulk density of not less than 1.0 g/cm 3 and a specific gas permeability of not more than 0.2 ml/cm. hr. mmAq; a porous layer of a uniformly porous carbonaceous material having an average bulk density of not less than 1.0 g/cm 3 and a specific gas permeability; of 0.3-1.0 g/cm 3 and a specific gas permeability of not less than 20 ml/cm. hr. mmAq; the thickness of said dense layer being not more than half of the thickness of said electrode substrate; a plurality of holes extending between two parallel sides of said porous layer and parallel to the surface of said electrode substrate, said holes being provided near the center of the thickness direction of said porous layer and having a circular cross section.
Claim 3
Dependent Claim
16 words
The substrate of claim 1, in which the hole has a diameter of b 0.5-3.0 mm.
Claim 4
Dependent Claim
24 words
The substrate of claim 1 or 2, in which not less than 60% of pores in the porous layer have a diameter of 10-100μ.
Claim 5
Dependent Claim
16 words
The substrate of claim 1 or 2, in which the dense layer is a graphite sheet.
Claim 6
Dependent Claim
122 words
A carbonaceous electrode substrate for a fuel cell, comprising: a dense layer; two porous layers of a uniformly porous carbonaceous material, each porous layer being provided on opposite surfaces of said dense layer, the thickness of said dense layer being not more than half of the thickness of said electrode substrate, and a plurality of holes in each of said porous layers extending between two parallel sides of said layer and parallel to the surface of said electrode substrate, said holes being provided near the center of the thickness direction of said porous layer having a circular cross-section, the holes in one of said layers extending in a direction perpendicular to the direction of the holes of the other of said layer.
Claim 7
Dependent Claim
122 words
A carbonaceous electrode substrate for a fuel cell, comprising: a dense layer; two porous layers of a uniformly porous carbonaceous material, each porous layer being provided on opposite surfaces of said dense layer, the thickness of said dense layer being not more than half of the thickness of said electrode substrate, and a plurality of holes in each of said porous layers extending between two parallel sides of said layer and parallel to the surface of said electrode substrate, said holes being provided near the center of the thickness direction of said porous layer having a circular cross-section, the holes in one of said layers extending in a direction perpendicular to the direction of the holes of the other of said layer.
Claim 8
Dependent Claim
15 words
The substrate of claim 5, in which the bole has a diameter of 0.5-3.0 mm.
Claim 9
Dependent Claim
24 words
The substrate of claim 5 or 6, in which not less than 60% of pores in the porous layer have a diameter of 10-100μ.
Claim 10
Dependent Claim
19 words
The substrate of claim 5 or 6, in which the thickness of the dense layer is preferably 0.1-3.0 mm.
Claim 11
Dependent Claim
16 words
The substrate of claim 5 or 6, in which the dense layer is a graphite sheet.
Claim 12
Dependent Claim
16 words
A fuel cell according to claim 5 wherein said dense layer extends beyond said porous layers.
Claim 13
Dependent Claim
24 words
The substrate of claim 10, which further comprises an another dense sheet for sealing the side of the porous layer parallel to the holes.
Claim 14
Dependent Claim
19 words
The substrate of claim 11, in which the another dense sheet is a graphite sheet having U-shaped cross section.
Claim 15
Dependent Claim
19 words
The substrate of claim 11 or 12, in which the another dense sheet is attached to the dense layer.
Claim 16
Dependent Claim
38 words
The substrate of claim 11 or 12, further comprising a peripheral sealer on the side of the pourous layer parallel to the holes on a gas manifold on the side of the porous layer perpendicular to the holes.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |