US3686444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone instruments
Assignee: Individual
•
Filing: 1971-03-01
•
Granted: 1972-08-22
•
Expires: 1991-03-01
Abstract
Abstract In a push-button telephone instrument including electronic circuits for storing push-button derived signals and for generating call signalling impulses, a battery within or associated with the instrument for energizing the electronic circuits is recharged during non-impulsing periods of telephone calls by means of the energizing current from the exchange for the carbon granule microphone.
Inventors
- 👤 Robert Andrew Stevenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:12
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
Telephone subscribers apparatus including a microphone transducer and a receiver transducer, at least one of which is energized in operation by a unidirectional current from an exchange battery, electronic circuit means for signalling to exchange equipment signals derived by operation of push-buttons of the instrument, and a rechargeable battery contained within the instrument for energizing said circuit means at least in part, wherein there are provided means to connect the battery in series with said one of the transducers of the instrument in the energizing current path thereof, shunt regulator means, and means connecting said shunt regulator means in parallel with the battery.
Claim 2
Dependent Claim
103 words
Telephone subscribers apparatus including a microphone transducer and a receiver transducer, at least one of which is energized in operation by a unidirectional current from an exchange battery, electronic circuit means for signalling to exchange equipment signals derived by operation of push-buttons of the instrument, and a rechargeable battery contained within the instrument for energizing said circuit means at least in part, wherein there are provided means to connect the battery in series with said one of the transducers of the instrument in the energizing current path thereof, shunt regulator means, and means connecting said shunt regulator means in parallel with the battery.
Claim 3
Dependent Claim
46 words
Telephone subscribers apparatus in accordance with claim 1 wherein said means to connect the battery in series with said transducer comprises a rectifier bridge one diagonal of which is connected in series with the transducer and the other diagonal of which is connected across said battery.
Claim 4
Dependent Claim
16 words
Telephone subscribers apparatus in accordance with claim 1 wherein said one transducer is the microphone transducer.
Claim 5
Dependent Claim
17 words
Telephone subscribers apparatus in accordance with claim 3 wherein said microphone transducer is a carbon granule transducer.
Claim 6
Dependent Claim
17 words
Telephone subscribers apparatus in accordance with claim 1 wherein said shunt regulator means comprises a zener diode.
Claim 7
Dependent Claim
17 words
Telephone subscribers apparatus in accordance with claim 1 wherein said shunt regulator means comprises a transistor circuit.
References Cited (Backward Citations)
US3510584A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |