US2794972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective signalling system
Assignee: General Telephone Laboratories Inc
•
Filing: 1952-11-05
•
Granted: 1957-06-04
•
Expires: 1972-11-05
Abstract
No abstract record available.
Inventors
- 👤 Robert P Dimmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:28
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/02; H04W88/022
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
FR778571A
Cited
US1496875A
Cited
US2063354A
Cited
US2309174A
Cited
US2321662A
Cited
US2534299A
Cited
US2591937A
Cited
US2617024A
Cited
US2607907A
Cited
US2625597A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-03 | 1960-12-03 | 1961-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-03 | 1964-12-03 | 1965-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-03 | 1968-12-03 | 1969-06-04 | $7700.00 | Window Closed / Lapsed |