US3090905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply overload protector
Assignee: Ampex Corp
•
Filing: 1959-08-13
•
Granted: 1963-05-21
•
Expires: 1979-08-13
Abstract
No abstract record available.
Inventors
- 👤 Robert J Ehret
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:30
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/577
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
IN COMBINATION WITH A REGULATED POWER SUPPLY HAVING THREE OUTPUT TERMINALS WITH A FIRST TERMINAL BEING NEGATIVE WITH RESPECT TO A SECOND TERMINAL AND A THIRD TERMINAL BEING POSITIVE WITH RESPECT TO THE SECOND TERMINAL AND HAVING A CURRENT-PASSING ELEMENT IN SERIES WITH ONE OF THE FIRST AND THIRD TERMINALS; AN OVERLOAD PROTECTION CIRCUIT COMPRISING A FIRST VARIABLE CONDUCTANCE DEVICE COUPLED BETWEEN A CONTROL ELEMENT OF THE CURRENT-PASSING ELEMENT AND THE FIRST TERMINAL, A VOLTAGE DIVIDER CONNECTED BETWEEN THE FIRST AND SECOND TERMINALS WITH AN INTERMEDIATE POINT COUPLED TO A CONTROL ELEMENT OF THE FIRST VARIABLE CONDUCTANCE DEVICE FOR NORMALLY BIASING THE DEVICE IN A NONCONDUCTIVE STATE, MEANS CONNECTED IN SERIES WITH THE CURRENT-PASSING ELEMENT FOR SENSING THE VALUE OF CURRENT FLOW AND ALTERING THE EFFECT OF THE BIASING OF THE FIRST VARIABLE CONDUCTANCE DEVICE TO PROVIDE CONDUCTION THEREOF AT A PREDETERMINED VALUE OF CURRENT FLOW, A SECOND VARIABLE CONDUCTANCE DEVICE COUPLED BETWEEN THE
Claim 2
Dependent Claim
154 words
IN COMBINATION WITH A REGULATED POWER SUPPLY HAVING THREE OUTPUT TERMINALS WITH A FIRST TERMINAL BEING NEGATIVE WITH RESPECT TO A SECOND TERMINAL AND A THIRD TERMINAL BEING POSITIVE WITH RESPECT TO THE SECOND TERMINAL AND HAVING A CURRENT-PASSING ELEMENT IN SERIES WITH ONE OF THE FIRST AND THIRD TERMINALS; AN OVERLOAD PROTECTION CIRCUIT COMPRISING A FIRST VARIABLE CONDUCTANCE DEVICE COUPLED BETWEEN A CONTROL ELEMENT OF THE CURRENT-PASSING ELEMENT AND THE FIRST TERMINAL, A VOLTAGE DIVIDER CONNECTED BETWEEN THE FIRST AND SECOND TERMINALS WITH AN INTERMEDIATE POINT COUPLED TO A CONTROL ELEMENT OF THE FIRST VARIABLE CONDUCTANCE DEVICE FOR NORMALLY BIASING THE DEVICE IN A NONCONDUCTIVE STATE, MEANS CONNECTED IN SERIES WITH THE CURRENT-PASSING ELEMENT FOR SENSING THE VALUE OF CURRENT FLOW AND ALTERING THE EFFECT OF THE BIASING OF THE FIRST VARIABLE CONDUCTANCE DEVICE TO PROVIDE CONDUCTION THEREOF AT A PREDETERMINED VALUE OF CURRENT FLOW, A SECOND VARIABLE CONDUCTANCE DEVICE COUPLED BETWEEN THE
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-05-20 | 1966-11-19 | 1967-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-20 | 1970-11-19 | 1971-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-20 | 1974-11-19 | 1975-05-21 | $7700.00 | Window Closed / Lapsed |