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Patent US4459342A successfully refreshed from Google Patents.
US4459342A
Expired / Lapsed
US
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Ribbed substrate for fuel cell electrode
Assignee: Kureha Corp
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Filing: 1983-08-19
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Granted: 1984-07-10
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Expires: 2003-08-19
Abstract
Abstract A porous ribbed substrate for a fuel cell electrode is herein disclosed which has a ribbed layer on one side and a non-ribbed layer with a bulk density larger than the bulk density of the ribbed layer. The fuel cell electrode substrate has a porosity of 50-80% and good mechanical strength such as a bending strength of not less than 50 kg/cm 2 . A fuel cell prepared from the electrode substrate has excellent properties.
Inventors
- 👤 Masatomo Shigeta
- 👤 Kuniyuki Saitoh
- 👤 Hiroyuki Fukuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:45
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/96; H01M8/00; H01M8/02; H01M8/0202; H01M8/0247; H01M4/8636; H01M8/023; H01M8/0234; H01M8/0239; H01M8/0241; H01M8/0243; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
30 words
A porous ribbed substrate for a fuel cell electrode comprising a non-ribbed layer and a ribbed layer having a bulk density smaller than the bulk density of the non-ribbed layer.
Claim 2
Dependent Claim
30 words
A porous ribbed substrate for a fuel cell electrode comprising a non-ribbed layer and a ribbed layer having a bulk density smaller than the bulk density of the non-ribbed layer.
Claim 3
Dependent Claim
31 words
The substrate of claim 1, in which the bulk density of the ribbed layer is 0.4-0.7 g/cm 3 and the bulk density of the non-ribbed layer is 0.5-0.9 g/cm 3 .
Claim 4
Dependent Claim
32 words
The substrate of claim 1 or 2, in which the non-ribbed layer has a thickness of from 1/50 to 1/2 of the thickness of the substrate minus the thickness of the ribs.
Claim 5
Dependent Claim
97 words
The substrate of any one of claims 1-3 having a bending strength of not less than 50 kg/cm 2 and a porosity of 50-80%, not less than 70% of pores being open pores, not less than 60% of the pores in the ribbed layer having a diameter in the range of 5-50 μm, not less than 60% of the pores in the non-ribbed layer having a diameter in the range of 1-30 μm and an average diameter of the pores in the ribbed layer being larger than the average diameter of the pores in the non-ribbed layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |