US2743315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuits for telephone answering and recording devices
Assignee: TELEPHONE ANSWERING AND RECORD
•
Filing: 1952-10-23
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Granted: 1956-04-24
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Expires: 1972-10-23
Abstract
No abstract record available.
Inventors
- 👤 Harry R Van Deventer
- 👤 John J Shively
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:25
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/64; H04M1/65; H04M1/654
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2537407A
Cited
US2709202A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-24 | 1959-10-24 | 1960-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-24 | 1963-10-24 | 1964-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-24 | 1967-10-24 | 1968-04-24 | $7700.00 | Window Closed / Lapsed |