US2690477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone alarm system
Assignee: Individual
•
Filing: 1953-10-23
•
Granted: 1954-09-28
•
Expires: 1973-10-23
Abstract
No abstract record available.
Inventors
- 👤 Friedmann Louis Martin
- 👤 Ross Karl Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:11
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/04; G; G08; G08B; G08B29/00; G08B29/02; G08B29/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-27 | 1958-03-29 | 1958-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-27 | 1962-03-29 | 1962-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-27 | 1966-03-29 | 1966-09-28 | $7700.00 | Window Closed / Lapsed |