US3952751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-performance electrotherapeutic apparatus
Assignee: Individual
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Filing: 1975-01-08
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Granted: 1976-04-27
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Expires: 1995-01-08
Abstract
Abstract Improved electrotherapeutic apparatus comprises A. an electromagnetic energy radiating head including primary and secondary coils and a capacitor electrically connected across the secondary coil, B. and an input circuit including a source of high frequency oscillations, a power amplifier and a control circuit for creating and transmitting to the head a sequence of pulses of high frequency electrical energy and for controlling the amplitude of the pulses and the intervals therebetween, the pulses having substantially rectangular shape and having a repetition rate and duration characterized in that they define a duty factor of between 0.35 and 0.55, where (duty factor) = (pulse repetition rate in pulses per second) × (pulse duration in micro seconds).
Inventors
- 👤 Frank A. Yarger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:58
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/40
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
164 words
Improved electrotherapeutic apparatus comprising a. an electromagnetic energy radiating head including primary and secondary coils and a capacitor electrically connected across the secondary coil, b. and input circuit means connected with the primary coil of the head and including a source of high frequency oscillations, power amplifier means, and control means for creating and transmitting to the primary coil of the head a sequence of pulses of high frequency electrical energy and for controlling the amplitude of the pulses and the intervals therebetween, the pulses having substantially rectangular shape and having a repetition rate and duration characterized in that they define a duty factor of between 0.35 and 0.55, where (duty factor) = (pulse repetition rate in pulses per second) × (pulse duration in micro seconds) c. said power amplifier means being electrically connected in series sequence with said source of high frequency oscillations, said power amplifier means including at least four ceramic type vacuum tubes having parallel outputs producing said substantially rectangular pulses.
Claim 2
Dependent Claim
164 words
Improved electrotherapeutic apparatus comprising a. an electromagnetic energy radiating head including primary and secondary coils and a capacitor electrically connected across the secondary coil, b. and input circuit means connected with the primary coil of the head and including a source of high frequency oscillations, power amplifier means, and control means for creating and transmitting to the primary coil of the head a sequence of pulses of high frequency electrical energy and for controlling the amplitude of the pulses and the intervals therebetween, the pulses having substantially rectangular shape and having a repetition rate and duration characterized in that they define a duty factor of between 0.35 and 0.55, where (duty factor) = (pulse repetition rate in pulses per second) × (pulse duration in micro seconds) c. said power amplifier means being electrically connected in series sequence with said source of high frequency oscillations, said power amplifier means including at least four ceramic type vacuum tubes having parallel outputs producing said substantially rectangular pulses.
Claim 3
Dependent Claim
12 words
The apparatus of claim 1 wherein said duty factor is about 0.45.
Claim 4
Dependent Claim
24 words
The apparatus of claim 1 wherein said control means includes means to produce pulses per second ≈ 3000 and pulse duration ≈ 150 microseconds.
Claim 5
Dependent Claim
23 words
The apparatus of claim 1 wherein said input circuit means includes a series resonant circuit at the oscillatory signal input to said tubes.
Claim 6
Dependent Claim
138 words
Improved electrotherapeutic apparatus, comprising a. an electromagnetic energy radiating head including primary and secondary coils and a capacitor electrically connected across the secondary coil, b. and input circuit means connected with the primary coil of the head and including a source of high frequency oscillations, power amplifier means, and control means for creating and transmitting to the primary coil of the head a sequence of pulses of high frequency electrical energy and for controlling the amplitude of the pulses and the intervals therebetween, said source and amplifier means being connected, said pulses having substantially rectangular shape, c. said power amplifier means comprising at least four ceramic type vacuum tubes, said tubes having parallel outputs each connected in series with the input to said primary coil, the oscillatory signal input to the tubes being connected to the tube grids.
Claim 7
Dependent Claim
138 words
Improved electrotherapeutic apparatus, comprising a. an electromagnetic energy radiating head including primary and secondary coils and a capacitor electrically connected across the secondary coil, b. and input circuit means connected with the primary coil of the head and including a source of high frequency oscillations, power amplifier means, and control means for creating and transmitting to the primary coil of the head a sequence of pulses of high frequency electrical energy and for controlling the amplitude of the pulses and the intervals therebetween, said source and amplifier means being connected, said pulses having substantially rectangular shape, c. said power amplifier means comprising at least four ceramic type vacuum tubes, said tubes having parallel outputs each connected in series with the input to said primary coil, the oscillatory signal input to the tubes being connected to the tube grids.
Claim 8
Dependent Claim
23 words
The apparatus of claim 5 wherein said power amplifier means includes a series resonant circuit at the oscillatory signal input to the tubes.
Claim 9
Dependent Claim
39 words
The apparatus of claim 6 wherein said control means includes a pulse duration control circuit connected with the screens of all of said tubes, said circuit including a voltage controlling variable resistor directly connected in series with said screens.
Claim 10
Dependent Claim
46 words
The apparatus of claim 5 including a tank circuit connected between the outputs of said tubes and the primary coil, said tank circuit including a variable capacitor and an inductor having a grounded end terminal, the inductor having an intermediate tap connected with said primary coil.
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) | 1979-04-27 | 1979-10-27 | 1980-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-27 | 1983-10-27 | 1984-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-27 | 1987-10-27 | 1988-04-27 | $7700.00 | Window Closed / Lapsed |