US2820866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relay
Assignee: General Telephone Laboratories Inc
•
Filing: 1953-11-20
•
Granted: 1958-01-21
•
Expires: 1973-11-20
Abstract
No abstract record available.
Inventors
- 👤 Kenneth W Graybill
- 👤 Sengebusch Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:35
CPC Classifications
H; H01; H01H; H01H50/00; H01H50/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US705092A
Cited
US1242895A
Cited
US1489087A
Cited
US1920135A
Cited
US2310138A
Cited
CH258697A
Cited
US2451810A
Cited
GB619291A
Cited
US2590996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |