US4006036A
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Method for reducing zinc oxide content of zinc particles
Assignee: Polaroid Corp
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Filing: 1974-12-26
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Granted: 1977-02-01
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Expires: 1994-12-26
Abstract
Abstract Zinc particles to be employed in the manufacture of zinc anodes for batteries are treated to decrease the zinc oxide content.
Inventors
- 👤 John C. Charkoudian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:29
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/38; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
66 words
The method for producing an anode assembly which comprises the steps, in sequence, of treating zinc particles with a solution of a zinc sequestering agent at a pH of about 7, washing the thus-treated zinc particles, mixing the zinc particles with a polymeric binder material, coating an electrically conductive substrate with the mixture, and drying the coating to form an adherent zinc coating on said substrate.
Claim 2
Independent Claim
66 words
The method for producing an anode assembly which comprises the steps, in sequence, of treating zinc particles with a solution of a zinc sequestering agent at a pH of about 7, washing the thus-treated zinc particles, mixing the zinc particles with a polymeric binder material, coating an electrically conductive substrate with the mixture, and drying the coating to form an adherent zinc coating on said substrate.
Claim 3
Dependent Claim
23 words
The method as defined in claim 1 which further includes the step of contacting said treated zinc particles with a surface passivating agent.
Claim 4
Dependent Claim
20 words
The method as defined in claim 1 wherein said sequestering agent is the disodium salt of ethylene diamine tetraacetic acid.
Claim 5
Dependent Claim
23 words
The method as defined in claim 1 wherein said zinc particles have a zinc oxide content prior to treatment is at least 3%.
Claim 6
Dependent Claim
19 words
The method as defined in claim 1 wherein the zinc oxide content subsequent to treatment is less than 3%.
Claim 7
Dependent Claim
16 words
The method as defined in claim 2 wherein said passivating agent is a quaternary ammonium compound.
Claim 8
Dependent Claim
15 words
The method as defined in claim 6 wherein said quaternary ammonium compound is benzyl-α-picolinium chloride.
Claim 9
Dependent Claim
19 words
The method as defined in claim 4 wherein the zinc oxide content prior to treatment is at least 5%.
References Cited (Backward Citations)
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US3524817A
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US3630781A
Cited
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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) | 1980-02-01 | 1980-08-02 | 1981-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-01 | 1984-08-02 | 1985-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-01 | 1988-08-02 | 1989-02-01 | $7700.00 | Window Closed / Lapsed |