US3308239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective answering and commanding telephone circuit
Assignee: Royal Business Funds Corp
•
Filing: 1962-05-18
•
Granted: 1967-03-07
•
Expires: 1982-05-18
Abstract
No abstract record available.
Inventors
- 👤 Waldman Herbert
- 👤 Wade P Lamson
- 👤 Meri Kalju
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:32
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/64; H04M1/65; H04M1/652
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
IN A TELEPHONE SYSTEM WHEREIN A CENTRAL OFFICE HAS VARIABLE CURRENT CONDUCTIVE BRIDGING MEANS BRIDGING AN OPEN SPEECH CIRCUIT AND WHEREIN A CALLING STATION INCLUDING A MICROPHONE SIGNALS A SUBSCRIBER BY MEANS OF A RINGING TONE OCCURRING AT INTERVALS DURING A RINGING CONNECTION WHILE A SPEECH CIRCUIT IS OPEN AND BEFORE IT IS COMPLETED, THE METHOD OF SIGNALLING FROM A CALLING STATION TO A SUBSCRIBERS STATION DURING THE RINGING CONNECTION AND BEFORE THE SUBSCRIBER HAS ANSWERED AND COMPLETED THE SPEECH CIRCUIT WHICH COMPRISES FEEDING A VARIABLE CURRENT SIGNAL TO THE MICROPHONE OF THE CALLING STATION DURING AT LEAST SOME OF THE INTERVALS BETWEEN SUCCESSIVE RINGS AND UTILIZING SAID VARIABLE CURRENT SIGNAL TO PERFORM A FUNCTION AT THE SUBSCRIBER''S STATION.
Claim 2
Dependent Claim
119 words
IN A TELEPHONE SYSTEM WHEREIN A CENTRAL OFFICE HAS VARIABLE CURRENT CONDUCTIVE BRIDGING MEANS BRIDGING AN OPEN SPEECH CIRCUIT AND WHEREIN A CALLING STATION INCLUDING A MICROPHONE SIGNALS A SUBSCRIBER BY MEANS OF A RINGING TONE OCCURRING AT INTERVALS DURING A RINGING CONNECTION WHILE A SPEECH CIRCUIT IS OPEN AND BEFORE IT IS COMPLETED, THE METHOD OF SIGNALLING FROM A CALLING STATION TO A SUBSCRIBERS STATION DURING THE RINGING CONNECTION AND BEFORE THE SUBSCRIBER HAS ANSWERED AND COMPLETED THE SPEECH CIRCUIT WHICH COMPRISES FEEDING A VARIABLE CURRENT SIGNAL TO THE MICROPHONE OF THE CALLING STATION DURING AT LEAST SOME OF THE INTERVALS BETWEEN SUCCESSIVE RINGS AND UTILIZING SAID VARIABLE CURRENT SIGNAL TO PERFORM A FUNCTION AT THE SUBSCRIBER''S STATION.
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) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |