US2948830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical storage apparatus
Assignee: International Business Machines Corp
•
Filing: 1948-09-20
•
Granted: 1960-08-09
•
Expires: 1968-09-20
Abstract
No abstract record available.
Inventors
- 👤 Williams Frederic Calland
- 👤 Kilburn Tom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:15
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/58; G; G11; G11C; G11C11/00; G11C11/21; G11C11/23; H01J31/60
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2034704A
Cited
US2241809A
Cited
US2219021A
Cited
US2407000A
Cited
US2436677A
Cited
US2508408A
Cited
US2639425A
Cited
US2524837A
Cited
US2432173A
Cited
US2498081A
Cited
US2451005A
Cited
US2458291A
Cited
US2473691A
Cited
US2560585A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-09 | 1964-02-08 | 1964-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-09 | 1968-02-08 | 1968-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-09 | 1972-02-08 | 1972-08-09 | $7700.00 | Window Closed / Lapsed |