Patent US5244833A successfully refreshed from Google Patents.
Patent US2686887A successfully refreshed from Google Patents.
US2686887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric spark gap
Assignee: Lucas Support Services Ltd
•
Filing: 1951-01-08
•
Granted: 1954-08-17
•
Expires: 1971-01-08
Abstract
No abstract record available.
Inventors
- 👤 Robinson Eric Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:55
CPC Classifications
H; H01; H01T; H01T2/00; H01T2/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1888068A
Cited
US2438191A
Cited
US2456854A
Cited
US2472115A
Cited
US2491979A
Cited
US2447377A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-16 | 1958-02-15 | 1958-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-16 | 1962-02-15 | 1962-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-16 | 1966-02-15 | 1966-08-17 | $7700.00 | Window Closed / Lapsed |