Patent US3504542A successfully refreshed from Google Patents.
Patent US2785855A successfully refreshed from Google Patents.
US2785855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical storage apparatus
Assignee: National Research Development Corp UK
•
Filing: 1950-11-24
•
Granted: 1957-03-19
•
Expires: 1970-11-24
Abstract
No abstract record available.
Inventors
- 👤 Williams Frederic Calland
- 👤 Tootill Geoffrey Colin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:40
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/21; G11C11/23; H; H01; H01J; H01J31/00; H01J31/08; H01J31/58; 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)
US2401729A
Cited
US2524837A
Cited
US2435840A
Cited
US2459131A
Cited
US2472165A
Cited
US2589460A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-18 | 1960-09-17 | 1961-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-18 | 1964-09-17 | 1965-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-18 | 1968-09-17 | 1969-03-19 | $7700.00 | Window Closed / Lapsed |