Patent US4757040A successfully refreshed from Google Patents.
Patent US3305404A successfully refreshed from Google Patents.
US3305404A
Expired / Lapsed
US
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Hermetically sealed storage battery
Assignee: Tudor AB
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Filing: 1964-10-22
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Granted: 1967-02-21
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Expires: 1984-10-22
Abstract
No abstract record available.
Inventors
- 👤 Sundberg Erik Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:55
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/70; H01M50/73; H01M10/00; H01M10/42; H01M10/52; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A STORAGE BATTERY COMPRISING A HERMETICALLY SEALED CASING, A LIQUID ELECTROLYTE AND NEGATIVE AND POSITIVE PLATES ARRANGED TO PROVIDE A SPACE FREE OF LIQUID ABOVE SAID PLATES AND A SPACE FILLED WITH LIQUID AT THE BOTTOM PORTIONS OF SAID PLATES; A CONDUIT EXTENDING FROM THE LIQUID FREE SPACE TO SAID SPACE AT THE BOTTOM PORTIONS OF SAID PLATES; SAID CONDUIT HAVING OPENINGS AT THE BOTTOM PORTIONS OF SAID NEGATIVE PLATES; AND MEANS FOR PUMPING GAS FROM SAID LIQUID FREE SPACE THROUGH SAID CONDUIT TO THEREBY DIRECT THE PUMPED GAS ALONG THE BOTTOM PORTION OF SAID NEGATIVE PLATES TO BE IN CONTACT WITH THE SURFACE OF THE NEGATIVE PLATES AS SAID GAS RISES TO SAID LIQUID FREE SPACE.
Claim 2
Dependent Claim
117 words
A STORAGE BATTERY COMPRISING A HERMETICALLY SEALED CASING, A LIQUID ELECTROLYTE AND NEGATIVE AND POSITIVE PLATES ARRANGED TO PROVIDE A SPACE FREE OF LIQUID ABOVE SAID PLATES AND A SPACE FILLED WITH LIQUID AT THE BOTTOM PORTIONS OF SAID PLATES; A CONDUIT EXTENDING FROM THE LIQUID FREE SPACE TO SAID SPACE AT THE BOTTOM PORTIONS OF SAID PLATES; SAID CONDUIT HAVING OPENINGS AT THE BOTTOM PORTIONS OF SAID NEGATIVE PLATES; AND MEANS FOR PUMPING GAS FROM SAID LIQUID FREE SPACE THROUGH SAID CONDUIT TO THEREBY DIRECT THE PUMPED GAS ALONG THE BOTTOM PORTION OF SAID NEGATIVE PLATES TO BE IN CONTACT WITH THE SURFACE OF THE NEGATIVE PLATES AS SAID GAS RISES TO SAID LIQUID FREE SPACE.
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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |