US3155831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective system for photoresponsive units
Assignee: Bruce Peebles and Co Ltd
•
Filing: 1961-02-16
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Granted: 1964-11-03
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Expires: 1981-02-16
Abstract
No abstract record available.
Inventors
- 👤 Goodwin David
- 👤 Dobbie Robert Lightbody
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:49
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89; G01N21/892; G01N21/894
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A PROTECTIVE SYSTEM FOR A PHOTO-RESPONSIVE UNIT INCLUDING A SOURCE OF POTENTIAL FOR THE UNIT, CAPACITANCE IN THE POTENTIAL SOURCE, AN ELECTRICALLY-CONTROLLED SWITCH CONNECTED BETWEEN THE POTENTIAL SOURCE, INCLUDING THE CAPACITANCE, AND THE PHOTO-RESPONSIVE UNIT TO REMOVE THE POTENTIAL FROM THE UNIT, AND A CIRCUIT CONNECTED TO THE SWITCH FOR CONTROLLING THE SWITCH, SAID CIRCUIT COMPRISING RESISTANCE AND ONLY STRAY CAPACITANCE WHEREBY A VERY SMALL TIME CONSTANT IS MAINTAINED WHICH IS DUE SUBSTANTIALLY TO RESISTANCE.
Claim 2
Dependent Claim
75 words
A PROTECTIVE SYSTEM FOR A PHOTO-RESPONSIVE UNIT INCLUDING A SOURCE OF POTENTIAL FOR THE UNIT, CAPACITANCE IN THE POTENTIAL SOURCE, AN ELECTRICALLY-CONTROLLED SWITCH CONNECTED BETWEEN THE POTENTIAL SOURCE, INCLUDING THE CAPACITANCE, AND THE PHOTO-RESPONSIVE UNIT TO REMOVE THE POTENTIAL FROM THE UNIT, AND A CIRCUIT CONNECTED TO THE SWITCH FOR CONTROLLING THE SWITCH, SAID CIRCUIT COMPRISING RESISTANCE AND ONLY STRAY CAPACITANCE WHEREBY A VERY SMALL TIME CONSTANT IS MAINTAINED WHICH IS DUE SUBSTANTIALLY TO RESISTANCE.
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) | 1967-11-03 | 1968-05-04 | 1968-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-03 | 1972-05-04 | 1972-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-03 | 1976-05-04 | 1976-11-03 | $7700.00 | Window Closed / Lapsed |