US3790409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Storage battery comprising negative plates of a wedge-shaped configuration
Assignee: National Aeronautics and Space Administration
•
Filing: 1972-02-22
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Granted: 1974-02-05
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Expires: 1992-02-22
Abstract
Abstract An improved silver-zinc battery particularly suited for use in an environment wherein the battery operatively is subjected to multiple charge/discharge cycling over extended periods. The battery is characterized by a plurality of positive plates of a planar configuration having interposed therebetween a plurality of negative plates of a wedge-shaped configuration and a separator system including a highly absorbent material contiguous with the surfaces of the plates and multiple semi-permeable membranes interposed therebetween.
Inventors
- 👤 J Fletcher
- 👤 R Bogner
- 👤 C Farris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:16
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/44; H01M50/411; H01M50/414; H01M50/417; H01M50/429; H01M50/449; H01M50/457; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
11 words
The improvement of claim 1 wherein the absorber is irradiated polypropylene.
Claim 2
Dependent Claim
14 words
The improvement of claim 1 wherein the absorber is a highly absorbent cellulosic material.
Claim 3
Dependent Claim
12 words
The improvement of claim 1 wherein the membrane is regenerated cellulose sheeting.
Claim 4
Dependent Claim
11 words
The improvement of claim 1 wherein the membrane is irradiated polyethylene.
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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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |