US3309625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for generating a linear sweep whose period is adjustable over a wide range
Assignee: Varian Medical Systems Inc
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Filing: 1965-07-22
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Granted: 1967-03-14
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Expires: 1985-07-22
Abstract
No abstract record available.
Inventors
- 👤 Charles F Lothrop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:35
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/10; H03K4/12; H03K4/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
A LINEAR SWEEP CIRCUIT COMPRISING A CAPACITOR, A RESISTOR, MEANS FOR CONNECTING SAID CAPACITOR AND SAID RESISTOR IN SERIES WITH EACH OTHER AND A D.C. SOURCE OF CONSTANT CURRENT TO GENERATE A VARYING VOLTAGE ACROSS SAID CAPACITOR, AN ELECTROMETER TUBE INCLUDING CATHODE, GRID AND ANODE ELECTRODES, SAID CAPACITOR AND D.C. SOURCE OF CONSTANT CURRENT SERIALLY CONNECTED BETWEEN SAID GRID AND CATHODE ELECTRODES OF SAID ELECTROMETER TUBE, ONE END OF SAID RESISTOR CONNECTED TO SAID GRID ELECTRODE OF SAID ELECTROMETER TUBE, A LOAD RESISTOR CONNECTED TO THE ANODE OF SAID ELECTROMETER TUBE, A D.C. SOURCE OF CONSTANT VOLTAGE CONNECTED BETWEEN SAID CATHODE ELECTRODE AND SAID LOAD RESISTOR OF SAID ELECTROMETER TUBE, SAID CATHODE ELECTRODE OF SAID ELECTROMETER TUBE COUPLED TO PROVIDE A VOLTAGE AT THE OTHER END OF SAID RESISTOR HAVING EXACTLY THE SAME VOLTAGE VARIATIONS AS THE VOLTAGE VARIATION ACROSS SAID CAPACITOR, A FEEDBACK CIRCUIT COUPLED TO SAID ANODE ELECTRODE OF SAID ELECTROMETER TUBE TO RECEIVE A VOLTAGE SIGNAL THEREFROM, SAID FEEDBACK CIRCUIT HAVING GAIN TO PROVIDE AN OUT-
Claim 2
Dependent Claim
169 words
A LINEAR SWEEP CIRCUIT COMPRISING A CAPACITOR, A RESISTOR, MEANS FOR CONNECTING SAID CAPACITOR AND SAID RESISTOR IN SERIES WITH EACH OTHER AND A D.C. SOURCE OF CONSTANT CURRENT TO GENERATE A VARYING VOLTAGE ACROSS SAID CAPACITOR, AN ELECTROMETER TUBE INCLUDING CATHODE, GRID AND ANODE ELECTRODES, SAID CAPACITOR AND D.C. SOURCE OF CONSTANT CURRENT SERIALLY CONNECTED BETWEEN SAID GRID AND CATHODE ELECTRODES OF SAID ELECTROMETER TUBE, ONE END OF SAID RESISTOR CONNECTED TO SAID GRID ELECTRODE OF SAID ELECTROMETER TUBE, A LOAD RESISTOR CONNECTED TO THE ANODE OF SAID ELECTROMETER TUBE, A D.C. SOURCE OF CONSTANT VOLTAGE CONNECTED BETWEEN SAID CATHODE ELECTRODE AND SAID LOAD RESISTOR OF SAID ELECTROMETER TUBE, SAID CATHODE ELECTRODE OF SAID ELECTROMETER TUBE COUPLED TO PROVIDE A VOLTAGE AT THE OTHER END OF SAID RESISTOR HAVING EXACTLY THE SAME VOLTAGE VARIATIONS AS THE VOLTAGE VARIATION ACROSS SAID CAPACITOR, A FEEDBACK CIRCUIT COUPLED TO SAID ANODE ELECTRODE OF SAID ELECTROMETER TUBE TO RECEIVE A VOLTAGE SIGNAL THEREFROM, SAID FEEDBACK CIRCUIT HAVING GAIN TO PROVIDE AN OUT-
References Cited (Backward Citations)
US3050686A
Cited
US2983831A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |