US3514548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone apparatus for discriminating between desired and undesired calls
Assignee: PRIVA PHONE Inc
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Filing: 1967-04-12
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Granted: 1970-05-26
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Expires: 1987-04-12
Abstract
Abstract This invention relates to telephone apparatus. More particularly, it relates to a telephone apparatus which discriminates between desired and undesired incoming calls and to accept or be actuated only by those calls which embody a predetermined supplemental signalling code.
Inventors
- 👤 Attilio A De Meo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:16
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/66; H04M1/663; H04M1/665
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) | 1973-05-25 | 1973-11-24 | 1974-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-25 | 1977-11-24 | 1978-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-25 | 1981-11-24 | 1982-05-26 | $7700.00 | Window Closed / Lapsed |