US4010329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crescendo control of signalling devices
Assignee: Individual
•
Filing: 1975-10-29
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Granted: 1977-03-01
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Expires: 1995-10-29
Abstract
Abstract A signalling circuit including an electrical to acoustic transducer which is sequentially energized by a pulsatile ringing source includes a potentiometer in series between the source and transducer. The potentiometer is continually decreased in resistance as source pulsations continue so that each successive acoustic output is of increased intensity. The wiper of the potentiometer is a needle of a meter movement and the fixed resistance of the potentiometer is arcuate and positioned in place of a meter scale. A passive quasi-integrator circuit is coupled between the source and the input to the meter movement for producing a generally increasing signal for advancing the wiper along the resistance.
Inventors
- 👤 Frederick Gaylord Draper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:49
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/02; H04M19/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
105 words
A crescendoing signalling device responsive to a source producing a train of signal pulsations said device comprising: an electrical to acoustical transducer; a potentiometer including a resistor means and a wiper for movement along said resistor means, said potentiometer having a wiper terminal and a terminal connected to said resistor means; said potentiometer being connected in series with said transducer via said terminals; an electric motor means having a rotor coupled to said wiper for moving said wiper along said resistor means; passive circuit means responsive to said source and driving said motor means in a manner for rotating said rotor as said pulsations continue.
Claim 2
Dependent Claim
105 words
A crescendoing signalling device responsive to a source producing a train of signal pulsations said device comprising: an electrical to acoustical transducer; a potentiometer including a resistor means and a wiper for movement along said resistor means, said potentiometer having a wiper terminal and a terminal connected to said resistor means; said potentiometer being connected in series with said transducer via said terminals; an electric motor means having a rotor coupled to said wiper for moving said wiper along said resistor means; passive circuit means responsive to said source and driving said motor means in a manner for rotating said rotor as said pulsations continue.
Claim 3
Dependent Claim
40 words
The device of claim 1 wherein the rotor of said motor means is spring biased and wherein said passive circuit means comprises a quasi-integration means for producing an output signal having a generally increasing amplitude for driving said motor means.
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) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |