US3591859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching circuit
Assignee: Applied Automation Inc
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Filing: 1969-06-26
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Granted: 1971-07-06
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Expires: 1989-06-26
Abstract
Abstract An electronic circuit employed to change an operation from one parallel train to another and to instigate a separate operation in that parallel train temporarily removed from service.
Inventors
- 👤 Grady T Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:16
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/26; C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C09C1/58; H03K17/51; H03K17/56; H03K17/72; H03K17/73; C01; C01P; C01P2004/00; C01P2004/50
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
146 words
An electronic latching circuit comprising, in combination, a first unijunction relaxation oscillAtor, and a second unijunction relaxation oscillator, the resistance-capacitor circuit in said first oscillator having a time constant less than the time constant of the resistance-capacitor circuit in said second oscillator, a flip-flop circuit triggered into operation by said first oscillator to a first operating position, said first operating position of said flip-flop triggering a transistor and a Zener diode into conduction to trigger a silicon controlled rectifier into conduction to cause an external current to flow through a rectifier and load, said second oscillator triggering a second silicon controlled rectifier into conduction to short the operating current to said first oscillator and said second oscillator to ground before said first oscillator makes a second cycle leaving said flip-flop, said transistor, said Zener diode and said first silicon controlled rectifier in said first operating condition.
Claim 2
Dependent Claim
146 words
An electronic latching circuit comprising, in combination, a first unijunction relaxation oscillAtor, and a second unijunction relaxation oscillator, the resistance-capacitor circuit in said first oscillator having a time constant less than the time constant of the resistance-capacitor circuit in said second oscillator, a flip-flop circuit triggered into operation by said first oscillator to a first operating position, said first operating position of said flip-flop triggering a transistor and a Zener diode into conduction to trigger a silicon controlled rectifier into conduction to cause an external current to flow through a rectifier and load, said second oscillator triggering a second silicon controlled rectifier into conduction to short the operating current to said first oscillator and said second oscillator to ground before said first oscillator makes a second cycle leaving said flip-flop, said transistor, said Zener diode and said first silicon controlled rectifier in said first operating condition.
Claim 3
Dependent Claim
32 words
The apparatus of claim 1 in which the first silicon controlled rectifier remains in said first operating condition until power is applied to said first and second oscillator circuits a second time.
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |