US3377537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric pumping system controlled by r-c liquid level measuring device
Assignee: Brailsford and Co Inc
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Filing: 1965-04-06
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Granted: 1968-04-09
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Expires: 1985-04-06
Abstract
No abstract record available.
Inventors
- 👤 Harrison D Brailsford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:01
CPC Classifications
G; G05; G05D; G05D9/00; G05D9/12; G01; G01F; G01F23/00; G01F23/30; G01F23/64; G01F23/68; G01F23/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN COMBINATION, A MOTOR; A SOURCE OF ELECTRIC CURRENT TO DRIVE SAID MOTOR; FIRST SWITCHING MEANS CONNECTED BETWEEN SAID MOTOR AND SAID SOURCE TO CONTROL THE TRANSMISSION OF DRIVING CURRENT TO SAID MOTOR, SAID SWITCHING MEANS COMPRISING A RELAY AND MEANS TO CONTROL THE OPERATION OF SAID RELAY, SAID MEANS COMPRISING A CAPACITOR, DISCHARGING RESISTOR MEANS, AND SECOND SWITCHING MEANS TO CONNECT SAID CAPACITOR TO SAID DISCHARGING RESISTOR MEANS DURING AT LEAST PART OF THE TIME THAT SAID MOTOR IS RUNNING AND TO CONNECT SAID CAPACITOR TO RECEIVE AN ELECTRIC CHARGE DURING AT LEAST PART OF THE TIME THAT SAID MOTOR IS NOT RUNNING.
Claim 2
Dependent Claim
104 words
IN COMBINATION, A MOTOR; A SOURCE OF ELECTRIC CURRENT TO DRIVE SAID MOTOR; FIRST SWITCHING MEANS CONNECTED BETWEEN SAID MOTOR AND SAID SOURCE TO CONTROL THE TRANSMISSION OF DRIVING CURRENT TO SAID MOTOR, SAID SWITCHING MEANS COMPRISING A RELAY AND MEANS TO CONTROL THE OPERATION OF SAID RELAY, SAID MEANS COMPRISING A CAPACITOR, DISCHARGING RESISTOR MEANS, AND SECOND SWITCHING MEANS TO CONNECT SAID CAPACITOR TO SAID DISCHARGING RESISTOR MEANS DURING AT LEAST PART OF THE TIME THAT SAID MOTOR IS RUNNING AND TO CONNECT SAID CAPACITOR TO RECEIVE AN ELECTRIC CHARGE DURING AT LEAST PART OF THE TIME THAT SAID MOTOR IS NOT RUNNING.
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) | 1971-04-09 | 1971-10-09 | 1972-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-09 | 1975-10-09 | 1976-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-09 | 1979-10-09 | 1980-04-09 | $7700.00 | Window Closed / Lapsed |