Patent US4078120A successfully refreshed from Google Patents.
US4078120A
Expired / Lapsed
US
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Stabilized iron electrodes
Assignee: Individual
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Filing: 1976-05-12
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Granted: 1978-03-07
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Expires: 1996-05-12
Abstract
Abstract Iron electrodes for use in chemoelectric cells are stabilized to provide an ideal discharge curve by adding a small (e.g., at least about 0.05% and preferably from 0.5 to 1% by weight of the iron) amount of lead sulfide.
Inventors
- 👤 Olle Birger Lindstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:07
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/24; H01M4/26; H01M4/30; H01M4/36; H01M4/48; H01M4/52; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
24 words
An electrochemical cell comprising a positive electrode, an electrolyte, and a negative electrode containing metallic iron and a small, effective amount of lead sulfide.
Claim 2
Dependent Claim
24 words
An electrochemical cell comprising a positive electrode, an electrolyte, and a negative electrode containing metallic iron and a small, effective amount of lead sulfide.
Claim 3
Dependent Claim
27 words
The electrochemical cell of claim 1 wherein the lead sulfide is present in an amount of at least about 0.05% by weight of the iron active material.
Claim 4
Dependent Claim
21 words
The electrochemical cell of claim 1 wherein the electrode contains from about 0.5 to 1% by weight of the lead sulfide.
Claim 5
Dependent Claim
13 words
The electrochemical cell of claim 1 wherein the electrode also contains iron sulfide.
Claim 6
Dependent Claim
24 words
The electrochemical cell of claim 1 wherein the lead sulfide is present in the form of particles having a particle size below 100 microns.
Claim 7
Dependent Claim
13 words
The electrochemical cell of claim 1 wherein the cell is an air-iron cell.
Claim 8
Dependent Claim
20 words
The electrochemical cell of claim 2 wherein the lead sulfide is present in an amount of at least about 0.1%.
Claim 9
Dependent Claim
23 words
The electrochemical cell of claim 5 wherein the lead sulfide particles have a particle size in the range of 0.1 to 10 microns.
Claim 10
Dependent Claim
23 words
The electrochemical cell of claim 8 wherein the lead sulfide particles have a particle size in the range of 1 to 5 microns.
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) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |