US2989730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective calling system
Assignee: Ambac International Corp
•
Filing: 1957-05-15
•
Granted: 1961-06-20
•
Expires: 1977-05-15
Abstract
No abstract record available.
Inventors
- 👤 Brosh Amnon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:26
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/02; H04W88/022; H04W88/025; H04W88/028; H04Q; H04Q5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1791587A
Cited
US2365284A
Cited
US2446943A
Cited
US2480624A
Cited
US2478361A
Cited
US2563127A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |