US2850558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leak-resistant dry cell
Assignee: Union Carbide Canada Ltd
•
Filing: 1955-09-01
•
Granted: 1958-09-02
•
Expires: 1975-09-01
Abstract
No abstract record available.
Inventors
- 👤 Lewis F Urry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:12
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/04; H01M6/06; H01M6/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
IN A LEAK-RESISTANT DRY CELL COMPRISING A CUP ELECTRODE CONTAINING ELECTROLYTE-WET DEPOLARIZER MIX, AND A SECOND ELECTRODE EMBEDDED THEREIN, THE COMBINATION OF A RIGID CLOSURE FOR SAID CELL, SAID CLOSURE HAVING GAS VENTING MEANS THEREIN, AN INNER SEAL POSITIONED BETWEEN SAID DEPOLARIZER MIX AND SAID CLOSURE AND OUT OF CONTACT WITH EITHER, THUS DEFINING A FREE SPACE BETWEEN SAID SEAL AND SAID CLOSURE AND A FREE SPACE BETWEEN SAID SEAL AND SAID
Claim 2
Dependent Claim
72 words
IN A LEAK-RESISTANT DRY CELL COMPRISING A CUP ELECTRODE CONTAINING ELECTROLYTE-WET DEPOLARIZER MIX, AND A SECOND ELECTRODE EMBEDDED THEREIN, THE COMBINATION OF A RIGID CLOSURE FOR SAID CELL, SAID CLOSURE HAVING GAS VENTING MEANS THEREIN, AN INNER SEAL POSITIONED BETWEEN SAID DEPOLARIZER MIX AND SAID CLOSURE AND OUT OF CONTACT WITH EITHER, THUS DEFINING A FREE SPACE BETWEEN SAID SEAL AND SAID CLOSURE AND A FREE SPACE BETWEEN SAID SEAL AND SAID
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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) | 1961-09-01 | 1962-03-03 | 1962-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-01 | 1966-03-03 | 1966-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-01 | 1970-03-03 | 1970-09-02 | $7700.00 | Window Closed / Lapsed |