Patent US1784360A successfully refreshed from Google Patents.
US4003000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sinusoidal oscillator with electronically variable frequency
Assignee: Unisys Corp
•
Filing: 1975-05-27
•
Granted: 1977-01-11
•
Expires: 1995-05-27
Abstract
Abstract A sinusoidal oscillator including means for electronically varying the frequency of oscillation by altering the phase angle of the amplifier circuit phase shift.
Inventors
- 👤 Frank J. Sordello
- 👤 Robert L. Cloke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:41
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/20; H03B5/24; H03B5/08; H03B5/12; H03B5/1203; H03B5/1231; H03B5/1237; H03B5/124; H03B2200/00; H03B2200/006; H03B2200/0068; H03B2201/00; H03B2201/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
89 words
A variable frequency sinusoidal oscillator comprising: an amplifier system; a feedback circuit for the amplifier system, said feedback circuit and said amplifier system including means for causing a phase shift of three hundred sixty degrees in signals transmitted therethrough such that the oscillaator will oscillate at a given frequency; means to detect the oscillation frequency of the oscillator; and reactive circuit means connecting with the transistor to vary the phase shift of the amplifier gain thereby to vary the oscillation frequency of the oscillator within a predetermined frequency range.
Claim 2
Dependent Claim
89 words
A variable frequency sinusoidal oscillator comprising: an amplifier system; a feedback circuit for the amplifier system, said feedback circuit and said amplifier system including means for causing a phase shift of three hundred sixty degrees in signals transmitted therethrough such that the oscillaator will oscillate at a given frequency; means to detect the oscillation frequency of the oscillator; and reactive circuit means connecting with the transistor to vary the phase shift of the amplifier gain thereby to vary the oscillation frequency of the oscillator within a predetermined frequency range.
Claim 3
Dependent Claim
33 words
A variable frequency sinusoidal oscillator as defined in claim 1 wherein said feedback circuit includes a variable resistance whereby by changing the value of said feedback circuit resistance the frequency range is changed.
Claim 4
Dependent Claim
24 words
A variable frequency sinusoidal oscillator as defined in claim 1 wherein said amplifier system includes a transistor connected to amplify the signal transmitted therethrough.
Claim 5
Dependent Claim
37 words
A variable frequency sinusoidal oscillator as defined in claim 3 wherein said amplifier system includes a variable resistance in the emitter circuit of the amplifier which when regulated will vary the phase shift of the amplifier system.
Claim 6
Dependent Claim
117 words
A variable frequency sinusoidal oscillator comprising: an amplifier system including a transistor connected to amplify the signal transmitted therethrough; a feedback circuit for the amplifier system, said feedback circuit and said amplifier system including means for causing a phase shift of three hundred sixty degrees in signals transmitted therethrough such that the oscillator will oscillate at a given frequency, said means for causing a phase shift including a variable resistor and an inductor in parallel connection in the emitter circuit of the amplifier; means to detect the oscillation frequency of the oscillator; and means to vary the phase shift of the amplifier system thereby to vary the oscillation frequency of the oscillator within a predetermined frequency range.
Claim 7
Dependent Claim
117 words
A variable frequency sinusoidal oscillator comprising: an amplifier system including a transistor connected to amplify the signal transmitted therethrough; a feedback circuit for the amplifier system, said feedback circuit and said amplifier system including means for causing a phase shift of three hundred sixty degrees in signals transmitted therethrough such that the oscillator will oscillate at a given frequency, said means for causing a phase shift including a variable resistor and an inductor in parallel connection in the emitter circuit of the amplifier; means to detect the oscillation frequency of the oscillator; and means to vary the phase shift of the amplifier system thereby to vary the oscillation frequency of the oscillator within a predetermined frequency range.
Claim 8
Dependent Claim
28 words
A variable frequency sinusoidal oscillator as defined in claim 5 wherein said amplifier system includes a capacitor in series connection with said variable resistor in the emitter circuit.
Claim 9
Dependent Claim
35 words
A variable frequency sinusoidal oscillator as defined in claim 4 wherein said feedback circuit includes a variable resistor which when regulated to change the value of said feedback circuit resistance will change the frequency range.
Claim 10
Dependent Claim
38 words
A variable frequency sinusoidal oscillator as defined in claim 4 wherein said emitter circuit variable resistance comprises a diode with means to vary the magnitude of electric current passing therethrough thereby varying the resistance level of the diode.
Claim 11
Dependent Claim
103 words
A variable frequency sinusoidal oscillator comprising: an amplifier system including a transistor with a variable resistor and a capacitor in parallel connection with an inductor in the emitter circuit thereof; a feedback circuit connecting the transistor base and collector and including an inductor, a capacitor and a resistor; said amplifier system and said feedback circuit causing a phase shift in the signals passing therethrough whereby said oscillator will oscillate at a given frequency; means to detect said frequency of oscillation; and means to vary the amplifier system resistance value thereby to change the frequency of oscillation of said oscillator within a frequency range.
Claim 12
Dependent Claim
103 words
A variable frequency sinusoidal oscillator comprising: an amplifier system including a transistor with a variable resistor and a capacitor in parallel connection with an inductor in the emitter circuit thereof; a feedback circuit connecting the transistor base and collector and including an inductor, a capacitor and a resistor; said amplifier system and said feedback circuit causing a phase shift in the signals passing therethrough whereby said oscillator will oscillate at a given frequency; means to detect said frequency of oscillation; and means to vary the amplifier system resistance value thereby to change the frequency of oscillation of said oscillator within a frequency range.
Claim 13
Dependent Claim
42 words
A variable frequency sinusoidal oscillator as defined in claim 9 including means for varying the resistive value of the feedback circuit resistance thereby to change the frequency range through which the oscillation frequency can be varied by varying the amplifier system resistance.
References Cited (Backward Citations)
US3076945A
Cited
US3436681A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |