US3207957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety control circuit
Assignee: CTS of Canada Ltd
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Filing: 1962-05-23
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Granted: 1965-09-21
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Expires: 1982-05-23
Abstract
No abstract record available.
Inventors
- 👤 Robert W Naylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:39
CPC Classifications
F; F16; F16P; F16P3/00; F16P3/18; F16P3/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A CONTROL SYSTEM FOR A MACHINE COMPRISING: A SOURCE OF DIRECT CURRENT; A PAIR OF SWITCHES CONNECTED IN PARALLEL HAVING A FIRST POSITION AND A SECOND POSITIONF A CAPACITOR ASSOCIATED WITH EACH OF THE SWITCHES AND ARRANGED TO BE CONNECTED TO THE SOURCE OF DIRECT CURRENT WHEN ITS ASSOCIATED SWITCH IS IN THE FIRST POSITION; MEANS FOR DISCHARGING THE CAPACITOR ASSOCIATED WITH EACH OF THE SWITCHES WHEN THE SWITCH IS IN THE SECOND POSITION; AN ELECTROMAGNETIC RELAY FOR CONTROLLING THE MACHINE ARRANGED TO BE ACTUATED BY THE CAPACITORS WHEN THE SWITCHES ARE IN SECOND POSITION; AND RESISTANCE MEANS FOR CONTROLLING THE AMOUNT OF CURRENT FLOWING TO THE RELAY FROM THE CAPACITORS AND THE LENGTH OF TIME REQUIRED TO DISCHARGE THE CAPACITORS, SO THAT THE CAPACITORS MUST BE DISCHARGED CONCOMITANTLY TO PRODUCE SUFFICIENT CURRENT TO OPERATE THE RELAY.
Claim 2
Dependent Claim
137 words
A CONTROL SYSTEM FOR A MACHINE COMPRISING: A SOURCE OF DIRECT CURRENT; A PAIR OF SWITCHES CONNECTED IN PARALLEL HAVING A FIRST POSITION AND A SECOND POSITIONF A CAPACITOR ASSOCIATED WITH EACH OF THE SWITCHES AND ARRANGED TO BE CONNECTED TO THE SOURCE OF DIRECT CURRENT WHEN ITS ASSOCIATED SWITCH IS IN THE FIRST POSITION; MEANS FOR DISCHARGING THE CAPACITOR ASSOCIATED WITH EACH OF THE SWITCHES WHEN THE SWITCH IS IN THE SECOND POSITION; AN ELECTROMAGNETIC RELAY FOR CONTROLLING THE MACHINE ARRANGED TO BE ACTUATED BY THE CAPACITORS WHEN THE SWITCHES ARE IN SECOND POSITION; AND RESISTANCE MEANS FOR CONTROLLING THE AMOUNT OF CURRENT FLOWING TO THE RELAY FROM THE CAPACITORS AND THE LENGTH OF TIME REQUIRED TO DISCHARGE THE CAPACITORS, SO THAT THE CAPACITORS MUST BE DISCHARGED CONCOMITANTLY TO PRODUCE SUFFICIENT CURRENT TO OPERATE THE RELAY.
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) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |