US3381092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic telephone alarm system with particular hook switch pulser arrangement
Assignee: LILLIAN O MCEWEN
•
Filing: 1964-06-18
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Granted: 1968-04-30
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Expires: 1984-06-18
Abstract
No abstract record available.
Inventors
- 👤 Lillian O Mcewen
- 👤 Harold W Ulmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:32
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/26; H04M1/27; H04M11/00; H04M11/04; H04M11/045
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) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |