Patent US3284577A successfully refreshed from Google Patents.
US3284577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substation apparatus employing a multi- frequency signaling arrangement
Assignee: —
•
Filing: —
•
Granted: 1966-11-08
•
Expires: 1983-11-08
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:38
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/26; H04M1/30; H04M1/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A TELEPHONE SIGNALING ARRANGEMENT COMPRISING A RESONANT CIRCUIT HAVING A PLURALITY OF SELECTIVELY CONTROLLABLE RESONANT FREQUENCIES, MEANS FOR SELECTING A FREQUENCY OF SAID RESONANT CIRCUIT, AMPLIFIER MEANS COUPLED TO SAID RESONANT CIRCUIT AND INCLUDING A BIASING CIRCUIT, A CIRCUIT EXTENDING OVER SAID RESONANT CIRCUIT AND SAID BIASING CIRCUIT IN SERIES, AND SWITCHING MEANS OPERATIVE TO SHORT CIRCUIT THE RESONANT CIRCUIT PORTION OF SAID SERIES CIRCUIT FOR SIMULTANEOUSLY STARTING OSCILLATIONS OF SAID RESONANT CIRCUIT AND RENDERING SAID AMPLIFIER MEANS EFFECTIVE WHEREBY SUSTAINED OSCILLATIONS ARE SET UP AT SAID SELECTED FREQUENCY.
Claim 2
Dependent Claim
89 words
A TELEPHONE SIGNALING ARRANGEMENT COMPRISING A RESONANT CIRCUIT HAVING A PLURALITY OF SELECTIVELY CONTROLLABLE RESONANT FREQUENCIES, MEANS FOR SELECTING A FREQUENCY OF SAID RESONANT CIRCUIT, AMPLIFIER MEANS COUPLED TO SAID RESONANT CIRCUIT AND INCLUDING A BIASING CIRCUIT, A CIRCUIT EXTENDING OVER SAID RESONANT CIRCUIT AND SAID BIASING CIRCUIT IN SERIES, AND SWITCHING MEANS OPERATIVE TO SHORT CIRCUIT THE RESONANT CIRCUIT PORTION OF SAID SERIES CIRCUIT FOR SIMULTANEOUSLY STARTING OSCILLATIONS OF SAID RESONANT CIRCUIT AND RENDERING SAID AMPLIFIER MEANS EFFECTIVE WHEREBY SUSTAINED OSCILLATIONS ARE SET UP AT SAID SELECTED FREQUENCY.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-07 | 1970-05-09 | 1970-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-07 | 1974-05-09 | 1974-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-07 | 1978-05-09 | 1978-11-08 | $7700.00 | Window Closed / Lapsed |