Patent US4104449A successfully refreshed from Google Patents.
US4104449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Primary battery of the remotely activated type
Assignee: Electrochem Inc
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Filing: 1976-10-26
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Granted: 1978-08-01
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Expires: 1996-10-26
Abstract
Abstract The present invention includes a primary battery of the remotely activated type which may include one or more zinc electrodes and which is filled with a liquid electrolyte only when the battery is to be activated. A novel feature of the invention is the use of an acid or mixture of acids in aqueous solution as the electrolyte. Hydrochloric acid, phosphoric acid and sulfuric acid are preferred, although other acid can also be used in various concentrations as the electrolyte. The voltage of the battery is unexpectedly higher and the battery has a faster activation time at low temperatures than if an alkaline electrolyte were used. A superior high voltage short duration battery is thus obtained.
Inventors
- 👤 Werner Bohnstedt
- 👤 Manfred Stommel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:02
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/30; H01M6/32; H01M6/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
26 words
An improved primary battery comprising at least one zinc electrode and a silver oxide counter-electrode, said battery including acid in aqueous solution as a battery-activating electrolyte.
Claim 2
Dependent Claim
26 words
An improved primary battery comprising at least one zinc electrode and a silver oxide counter-electrode, said battery including acid in aqueous solution as a battery-activating electrolyte.
Claim 3
Dependent Claim
25 words
The improved primary battery of claim 1 wherein said battery is activatable to provide a relatively high voltage for a short time span after activation.
Claim 4
Dependent Claim
33 words
The improved primary battery of claim 2 wherein said acid includes sulfuric acid in a concentration sufficient to dissolve the passivation layer on said zinc electrode rapidly at temperatures below about 0° C.
Claim 5
Dependent Claim
22 words
The improved primary battery of claim 3 wherein said sulfuric acid is in a concentration of about 5 to about 15 normal.
Claim 6
Dependent Claim
16 words
The improved primary battery of claim 4 wherein said sulfuric acid concentration is about 12 normal.
Claim 7
Dependent Claim
13 words
The improved primary battery of claim 2 wherein said acid comprises hydrochloric acid.
Claim 8
Dependent Claim
19 words
The improved primary battery of claim 6 wherein said hydrochloric acid is in a concentration of about 5 normal.
Claim 9
Dependent Claim
13 words
The improved primary battery of claim 2 wherein said acid comprises phosphoric acid.
Claim 10
Dependent Claim
19 words
The improved primary battery of claim 8 wherein said phosphoric acid is in a concentration of about 26 normal.
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) | 1981-07-31 | 1982-01-30 | 1982-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-31 | 1986-01-30 | 1986-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-31 | 1990-01-30 | 1990-08-01 | $7700.00 | Window Closed / Lapsed |