US3144581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency divider for video systems empolying blocking oscillator utilizing reverse breakdown diode in feedback circuit
Assignee: AT&T Inc
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Filing: 1961-05-09
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Granted: 1964-08-11
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Expires: 1981-05-09
Abstract
No abstract record available.
Inventors
- 👤 Greenburg Joel
- 👤 Larned A Meacham
- 👤 Donald H Nash
- 👤 Schenker Leo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:47
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/50; H03K4/54; H03K3/00; H03K3/02; H03K3/26; H03K3/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
IN A SWEEP CONTROL SYSTEM FOR AN ELECTRON BEAM DEVICE ADAPTED TO SCAN A RECTANGULAR AREA, MEANS GENERATING SIGNALS FOR CAUSING THE REPETITIVE SWEEP OF THE ELECTRON BEAM ACROSS THE WIDTH OF SAID AREA, A SINGLE-STAGE, TRIGGERED, BLOCKING OSCILLATOR CIRCUIT PRODUCING A TRIANGULAR OUTPUT WAVE AT A FREQUENCY WHICH IS MUCH LOWER THAN THE FREQUENCY OF SAID SIGNALS, MEANS APPLYING SAID SIGNALS TO TRIGGER SAID OSCILLATOR, MEANS APPLYING SAID WAVE TO SAID DEVICE FOR REPETITIVELY SWEEPING SAID ELECTRON BEAM THROUGH THE LENGTH OF SAID AREA, AND A REVERSE BREAKDOWN DIODE CONNECTED IN THE FEEDBACK CIRCUIT OF SAID OSCILLATOR FOR TERMINATING OSCILLATION AT A PREDETERMINED FEEDBACK VOLTAGE LEVEL.
Claim 2
Dependent Claim
107 words
IN A SWEEP CONTROL SYSTEM FOR AN ELECTRON BEAM DEVICE ADAPTED TO SCAN A RECTANGULAR AREA, MEANS GENERATING SIGNALS FOR CAUSING THE REPETITIVE SWEEP OF THE ELECTRON BEAM ACROSS THE WIDTH OF SAID AREA, A SINGLE-STAGE, TRIGGERED, BLOCKING OSCILLATOR CIRCUIT PRODUCING A TRIANGULAR OUTPUT WAVE AT A FREQUENCY WHICH IS MUCH LOWER THAN THE FREQUENCY OF SAID SIGNALS, MEANS APPLYING SAID SIGNALS TO TRIGGER SAID OSCILLATOR, MEANS APPLYING SAID WAVE TO SAID DEVICE FOR REPETITIVELY SWEEPING SAID ELECTRON BEAM THROUGH THE LENGTH OF SAID AREA, AND A REVERSE BREAKDOWN DIODE CONNECTED IN THE FEEDBACK CIRCUIT OF SAID OSCILLATOR FOR TERMINATING OSCILLATION AT A PREDETERMINED FEEDBACK VOLTAGE LEVEL.
References Cited (Backward Citations)
GB823315A
Cited
US3033996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-11 | 1968-02-10 | 1968-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-11 | 1972-02-10 | 1972-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-11 | 1976-02-10 | 1976-08-11 | $7700.00 | Window Closed / Lapsed |