Patent US4110519A successfully refreshed from Google Patents.
US4110519A
Expired / Lapsed
US
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Method for the production of electrodes for lead storage batteries
Assignee: Tudor AB
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Filing: 1977-09-15
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Granted: 1978-08-29
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Expires: 1997-09-15
Abstract
Abstract An improvement in the production of plate type electrodes for use in lead storage batteries from a dry lead powder mixture is disclosed. The lead powder is mixed with a small amount (0.1 to 3 weight percent) of polytetrafluoroethylene (PTFE) powder, the mixture is heated and treated to convert substantially all of the PTFE into fibrous form. The mixture is applied to an electrode grid under conditions whereby a coherent, unitary structure is formed. A hot liquid (e.g., water) may be added to the mixture to form a paste.
Inventors
- 👤 Ove Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:48
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/14; H01M4/16; H01M4/20; H01M4/36; H01M4/48; H01M4/56; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108; Y10T29/49115
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
77 words
A method for the production of a plate-type electrode for a lead storage battery comprising forming a mixture of lead powder which normally is at least 70% oxidized and from 0.1 to 3 percent by weight of polytetrafluoroethylene, heating the mixture, applying shear stresses to said powder mixture sufficient to convert substantially all of the polytetrafluoroethylene into fibrous form and applying the heated mixture to an electrode grid under conditions whereby a unitary, coherent structure is formed.
Claim 2
Independent Claim
77 words
A method for the production of a plate-type electrode for a lead storage battery comprising forming a mixture of lead powder which normally is at least 70% oxidized and from 0.1 to 3 percent by weight of polytetrafluoroethylene, heating the mixture, applying shear stresses to said powder mixture sufficient to convert substantially all of the polytetrafluoroethylene into fibrous form and applying the heated mixture to an electrode grid under conditions whereby a unitary, coherent structure is formed.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said mixture contains from 0.2 to 0.5 weight percent of polytetrafluoroethylene.
Claim 4
Dependent Claim
17 words
The method of claim 1 wherein the mixture is heated to a temperature of about 80° C.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein the heated mixture is further mixed with a liquid.
Claim 6
Dependent Claim
18 words
The method of claim 4 wherein the liquid is heated to a temperature of at least 60° C.
Claim 7
Dependent Claim
24 words
The method of claim 4 wherein the liquid is water or an electrolyte containing anions capable of forming insoluble or slightly soluble lead compounds.
Claim 8
Dependent Claim
14 words
An electrode for a lead storage battery produced by the process of claim 1.
Claim 9
Dependent Claim
14 words
An electrode for a lead storage battery produced by the process of claim 4.
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) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |