Patent US3309687A successfully refreshed from Google Patents.
Patent US2042840A successfully refreshed from Google Patents.
US2042840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Storage battery
Assignee: AT&T Inc
•
Filing: 1933-07-08
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Granted: 1936-06-02
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Expires: 1953-07-08
Abstract
No abstract record available.
Inventors
- 👤 Horace E Haring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:01
CPC Classifications
C; C22; C22C; C22C11/00; C22C11/02; H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/66; H01M4/68; H01M4/685; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1939-06-02 | 1939-12-02 | 1940-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-06-02 | 1943-12-02 | 1944-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-06-02 | 1947-12-02 | 1948-06-02 | $7700.00 | Window Closed / Lapsed |