US3356908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relay system
Assignee: Ebert Electronics Corp
•
Filing: 1959-11-06
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Granted: 1967-12-05
•
Expires: 1979-11-06
Abstract
No abstract record available.
Inventors
- 👤 Irving L Mitchell
- 👤 Sidney S Pressman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:11
CPC Classifications
H; H01; H01H; H01H47/00; H01H47/22; H01H47/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A RELAY SYSTEM OPERATIVE FROM AN A.C. SOURCE OF POWER, COMPRISING A RELAY COIL, OPERATING CONTACTS OPERABLE ONLY IN RESPONSE TO A PREDETERMINED MINIMUM VOLTAGE ACROSS SAID RELAY COIL, A CAPACITIVE REACTANCE CONNECTED IN A SERIES CIRCUIT WITH SAID RELAY COIL AND WITH SAID A.C. SOURCE OF POWER, SAID RELAY COIL HAVING INDUCTIVE REACTANCE AT LEAST APPROXIMATELY NUMERICALLY EQUAL TO SAID CAPACITIVE REACTANCE AT THE FREQUENCY OF SAID AC SOURCE OF POWER, SAID SERIES CIRCUIT HAVING A Q OF GREATER THAN UNITY, WHEREBY THE VOLTAGE ACROSS SAID RELAY COIL IS GREATER THAN THE VOLTAGE OF SAID A.C. SOURCE OF POWER, AND VARIABLE IMPEDANCE MEANS CONNECTED IN SHUNT TO ONE OF SAID CARPACITIVE REACTANCE AND SAID RELAY COIL FOR CONTROLLABLY MODIFYING SAID Q TO A VALUE BELOW UNITY, SAID LAST MEANS COMPRISING A VARIABLE IMPEDANCE INCLUDING A PHOTO-CONDUCTIVE CELL.
Claim 2
Dependent Claim
138 words
A RELAY SYSTEM OPERATIVE FROM AN A.C. SOURCE OF POWER, COMPRISING A RELAY COIL, OPERATING CONTACTS OPERABLE ONLY IN RESPONSE TO A PREDETERMINED MINIMUM VOLTAGE ACROSS SAID RELAY COIL, A CAPACITIVE REACTANCE CONNECTED IN A SERIES CIRCUIT WITH SAID RELAY COIL AND WITH SAID A.C. SOURCE OF POWER, SAID RELAY COIL HAVING INDUCTIVE REACTANCE AT LEAST APPROXIMATELY NUMERICALLY EQUAL TO SAID CAPACITIVE REACTANCE AT THE FREQUENCY OF SAID AC SOURCE OF POWER, SAID SERIES CIRCUIT HAVING A Q OF GREATER THAN UNITY, WHEREBY THE VOLTAGE ACROSS SAID RELAY COIL IS GREATER THAN THE VOLTAGE OF SAID A.C. SOURCE OF POWER, AND VARIABLE IMPEDANCE MEANS CONNECTED IN SHUNT TO ONE OF SAID CARPACITIVE REACTANCE AND SAID RELAY COIL FOR CONTROLLABLY MODIFYING SAID Q TO A VALUE BELOW UNITY, SAID LAST MEANS COMPRISING A VARIABLE IMPEDANCE INCLUDING A PHOTO-CONDUCTIVE CELL.
References Cited (Backward Citations)
GB335536A
Cited
GB344001A
Cited
US1895355A
Cited
FR44984E
Cited
US2402573A
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US2774015A
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US2924754A
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US2978588A
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US3080491A
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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) | 1970-12-04 | 1971-06-05 | 1971-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-04 | 1975-06-05 | 1975-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-04 | 1979-06-05 | 1979-12-05 | $7700.00 | Window Closed / Lapsed |