Patent US3954501A successfully refreshed from Google Patents.
US3954501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rechargeable electrodes utilizing unsintered fluorocarbon binder
Assignee: Gates Energy Products Inc
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Filing: 1975-04-28
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Granted: 1976-05-04
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Expires: 1995-04-28
Abstract
Abstract Polytetrafluoroethylene in aqueous dispersion is mixed with a finely divided electrochemically active rechargeable electrode material, such as zinc, zinc oxide, cadmium, cadmium oxide, nickel oxide, copper, copper oxide, silver, silver oxide, mercuric oxide, etc. The dispersion is broken by drying, freezing, solvent extraction, etc. Where zinc particles form the active material it may be desirable to amalgamate the zinc with mercury.
Inventors
- 👤 Guy Rampel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:14
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/04; H01M4/0438; H01M4/045; H01M4/0457; H01M4/24; H01M4/36; H01M4/48; H01M4/481; H01M4/62; H01M4/621; H01M4/622; H01M4/623; H01M4/624; H01M4/626; H01M4/64; H01M4/70; H01M4/72; H01M4/74; H01M4/745; H01M4/80; H01M4/801; H01M2004/026; H01M2004/027; H01M2004/028; H01M4/52; H01M4/54; H01M4/625; H01M4/66; H01M4/661; H01M4/808; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
92 words
A rechargeable electrolytic cell having enhanced gas recombination, capacity and cycle life, said cell comprising: a positive electrode; a negative electrode; a separator; an electrolyte; and one of said electrodes comprising: a foraminous, electrically conductive, substrate; a paste supported by said substrate, said paste comprising: a finely divided, particulate, rechargeable, active material; and a fibrous interconnecting network of an unsintered, uncoalesced, hydrophobic linear fluorocarbon polymer, said active material dispersed throughout and bound in said network and being highly accessible to said electrolyte and to gas being generated during overcharge of the cell.
Claim 2
Dependent Claim
92 words
A rechargeable electrolytic cell having enhanced gas recombination, capacity and cycle life, said cell comprising: a positive electrode; a negative electrode; a separator; an electrolyte; and one of said electrodes comprising: a foraminous, electrically conductive, substrate; a paste supported by said substrate, said paste comprising: a finely divided, particulate, rechargeable, active material; and a fibrous interconnecting network of an unsintered, uncoalesced, hydrophobic linear fluorocarbon polymer, said active material dispersed throughout and bound in said network and being highly accessible to said electrolyte and to gas being generated during overcharge of the cell.
Claim 3
Dependent Claim
26 words
The cell of claim 1 wherein said polymer forms between 0.5 and 25% by weight of the combined weight of said polymer and said active material.
Claim 4
Dependent Claim
22 words
The cell of claim 1 wherein said cell further comprises a sealed container, said electrodes, separator, and electrolyte disposed in said container.
Claim 5
Dependent Claim
11 words
The cell of claim 2 wherein said separator is electrolyte starved.
Claim 6
Dependent Claim
18 words
The cell of claim 2 wherein said positive and negative electrodes comprise active nickel and cadmium materials, respectively.
Claim 7
Dependent Claim
51 words
A rechargeable cell comprising positive and negative electrodes, at least one of said electrodes comprising: a a sintered porous plaque of bonded metallic powder; b an active material dispersed in the pores of said plaque; and c an unsintered, hydrophobic, fibrous, linear fluorocarbon polymer dispersed in the pores of said plaque.
Claim 8
Dependent Claim
51 words
A rechargeable cell comprising positive and negative electrodes, at least one of said electrodes comprising: a a sintered porous plaque of bonded metallic powder; b an active material dispersed in the pores of said plaque; and c an unsintered, hydrophobic, fibrous, linear fluorocarbon polymer dispersed in the pores of said plaque.
Claim 9
Dependent Claim
11 words
The cell of claim 6 wherein said active material is cadmium.
Claim 10
Dependent Claim
10 words
The cell of claim 6 wherein said polymer is polytetrafluoroethylene.
Claim 11
Dependent Claim
12 words
The cell of claim 6 wherein said powder is comprised of nickel.
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) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |