US3796565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of porous nickel plates
Assignee: Viridian Inc Canada
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Filing: 1973-03-16
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Granted: 1974-03-12
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Expires: 1993-03-16
Abstract
Abstract The process involves providing starting material composed of nickel powder smaller than 270 mesh standard Tyler screen. The nickel oxide content of the starting powder is adjusted to 0.7 to 1.4 percent by weight and the powder is slurried in a volatile liquid, optionally containing an organic binder. The slurry is heated to a temperature below that at which sintering occurs to evaporate the volatile liquid then the slurry is heated at sintering temperature in a reducing atmosphere.
Inventors
- 👤 H Hancock
- 👤 D Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:32
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/70; H01M4/80; B; B22; B22F; B22F3/00; B22F3/10; B22F3/11; B22F3/1143; B22F2998/00; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
22 words
The process as claimed in claim 1 wherein the starting material is larger than about 400 mesh standard Tyler screen in size.
Claim 2
Dependent Claim
38 words
The process as claimed in claim 1 wherein the nickel oxide constant of said starting material is adjusted by the addition thereto of freshly precipitated nickel hydroxide followed by heating to decompose the nickel hydroxide to nickel oxide.
Claim 3
Dependent Claim
17 words
The process as claimed in claim 1 wherein the sintering operation takes place in a hydrogen atmosphere.
Claim 4
Dependent Claim
102 words
A process for making a porous nickel plate including the steps of: providing a starting material composed of nickel pwder of less than about 270 mesh standard Tyler screen in size; adjusting the content of nickel oxide in said starting material to about 0.7 to about 1.4 percent by weight; dispersing the so-adjusted starting material in a volatile liquid to form a slurry; providing in said slurry an organic binder; heating said slurry to a temperature below sintering temperature but sufficient to evaporate the volatile liquid fraction thereof; and sintering said heated slurry in a reducing atmosphere to a finished sintered plate.
Claim 5
Dependent Claim
22 words
The process as claimed in claim 5 wherein the starting material is larger than about 400 mesh standard Tyler screen in size.
Claim 6
Dependent Claim
38 words
The process as claimed in claim 5 wherein the nickel oxide content of said starting material is adjusted by the addition thereto of freshly precipitated nickel hydroxide followed by heating to decompose the nickel hydroxide to nickel oxide.
Claim 7
Dependent Claim
17 words
The process as claimed in claim 5 wherein the sintering operation takes place in a hydrogen atmosphere.
Claim 8
Dependent Claim
41 words
The process as claimed in claim 5 wherein said organic binder is chosen from the group comprising an alkaline salt of carboxy methyl cellulose, an ammonium salt of carboxy methyl cellulose, hydroxy alkyl cellulose, hydroxy ethyl cellulose and hydroxy propyl cellulose.
Claim 9
Dependent Claim
103 words
A process for making a porous nickel plate including the steps of: providing a starting material composed of nickel powder of less than about 270 mesh standard Tyler screen in size; adjusting the content of nickel oxide in said starting material to about 0.7 to about 1.4 percent by weight; dispersing the so-adjusted starting material in a volatile liquid to form a slurry; providing in said slurry an organic binder; forming said slurry into a plate; heating said plate to a temperature below sintering temperature but sufficient to evaporate the volatile liquid fraction thereof; and sintering said heated plate in a reducing atmosphere.
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |