Patent US2821597A successfully refreshed from Google Patents.
US2821597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Register relay
Assignee: AT&T Inc
•
Filing: 1955-03-18
•
Granted: 1958-01-28
•
Expires: 1975-03-18
Abstract
No abstract record available.
Inventors
- 👤 Charles E Germanton
- 👤 John W Oliver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:40
CPC Classifications
H; H01; H01H; H01H51/00; H01H51/28; H01H51/281
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US701499A
Cited
US827964A
Cited
US762338A
Cited
AT71322B
Cited
US1953929A
Cited
US2187115A
Cited
US2387017A
Cited
US2397123A
Cited
US2489372A
Cited
US2609464A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |