Patent US3484553A successfully refreshed from Google Patents.
US3484553A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alarm system connected to a telephone subscriber's circuit so as to transmit an alarm through the central office without interfering with normal telephone operation
Assignee: Individual
•
Filing: 1966-04-26
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Granted: 1969-12-16
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Expires: 1986-04-26
Abstract
No abstract record available.
Inventors
- 👤 Clarence Anding Lovell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:21
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0004; H04M; H04M11/00; H04M11/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3120579A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-15 | 1973-06-16 | 1973-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-15 | 1977-06-16 | 1977-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-15 | 1981-06-16 | 1981-12-16 | $7700.00 | Window Closed / Lapsed |