US3267298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waveform converter
Assignee: International Business Machines Corp
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Filing: 1964-11-25
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Granted: 1966-08-16
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Expires: 1984-11-25
Abstract
No abstract record available.
Inventors
- 👤 Dale H Rumble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:56
CPC Classifications
H; H01; H01H; H01H85/00; H01H85/02; H01H85/04; H01H85/05; H01H85/055; H03; H03B; H03B28/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A CIRCUIT FOR CONVERTING A SQUARE WAVEFORM HAVING A SPECIFIED FUNDAMENTAL FREQUENCY TO A SINUSOIDAL WAVEFORM OF THE SAME SPECIFIED FUNDAMENTAL FREQUENCY, SAID CIRCUIT COMPRISING: A SQUARE SIGNAL SOURCE SUPPLYING THE SQUARE WAVEFORM TO BE CONVERTED; A TRANSISTOR HAVING BASE, EMITTER, AND COLLECTOR ELECTRODES, SAID EMITTER ELECTRODE BEING CONNECTED TO SAID SQUARE WAVE SIGNAL SOURCE; FREQUENCY-DEPENDENT IMPEDANCE MEANS, SAID IMPEDANCE MEANS BEING CONNECTED TO SAID BASE ELECTRODE AND EXHIBITING LOW IMPEDANCE TO SIGNALS OF SAID SPECIFIED FUNDAMENTAL FREQUENCY AND TO LOW ORDER HARMONICS OF SAID SPECIFIED FUNDAMENTAL FREQUENCY, AND EXHIBITING HIGH IMPEDANCE TO OTHER SIGNALS; TRANSISTOR BIASING MEANS INCLUDING A VOLTAGE SOURCE CONNECTED BETWEEN SAID EMITTER ELECTRODE AND SAID IMPEDANCE MEANS FOR BIASING SAID TRANSISTOR INTO CONDUCTION; AND OUTPUT CIRCUIT MEANS CONNECTED BETWEEN SAID COLLECTOR ELECTRODE AND SAID FREQUENCY-DEPENDENT IMPEDANCE MEANS FOR PROVIDING SAID SINUSOIDAL WAVEFORM.
Claim 2
Dependent Claim
136 words
A CIRCUIT FOR CONVERTING A SQUARE WAVEFORM HAVING A SPECIFIED FUNDAMENTAL FREQUENCY TO A SINUSOIDAL WAVEFORM OF THE SAME SPECIFIED FUNDAMENTAL FREQUENCY, SAID CIRCUIT COMPRISING: A SQUARE SIGNAL SOURCE SUPPLYING THE SQUARE WAVEFORM TO BE CONVERTED; A TRANSISTOR HAVING BASE, EMITTER, AND COLLECTOR ELECTRODES, SAID EMITTER ELECTRODE BEING CONNECTED TO SAID SQUARE WAVE SIGNAL SOURCE; FREQUENCY-DEPENDENT IMPEDANCE MEANS, SAID IMPEDANCE MEANS BEING CONNECTED TO SAID BASE ELECTRODE AND EXHIBITING LOW IMPEDANCE TO SIGNALS OF SAID SPECIFIED FUNDAMENTAL FREQUENCY AND TO LOW ORDER HARMONICS OF SAID SPECIFIED FUNDAMENTAL FREQUENCY, AND EXHIBITING HIGH IMPEDANCE TO OTHER SIGNALS; TRANSISTOR BIASING MEANS INCLUDING A VOLTAGE SOURCE CONNECTED BETWEEN SAID EMITTER ELECTRODE AND SAID IMPEDANCE MEANS FOR BIASING SAID TRANSISTOR INTO CONDUCTION; AND OUTPUT CIRCUIT MEANS CONNECTED BETWEEN SAID COLLECTOR ELECTRODE AND SAID FREQUENCY-DEPENDENT IMPEDANCE MEANS FOR PROVIDING SAID SINUSOIDAL WAVEFORM.
References Cited (Backward Citations)
US2727146A
Cited
US2775705A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-15 | 1970-02-14 | 1970-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-15 | 1974-02-14 | 1974-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-15 | 1978-02-14 | 1978-08-16 | $7700.00 | Window Closed / Lapsed |