US3237848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for preventing compressor slugging in a refrigeration system
Assignee: Tecumseh Products Co
•
Filing: 1958-09-04
•
Granted: 1966-03-01
•
Expires: 1978-09-04
Abstract
No abstract record available.
Inventors
- 👤 Ted O Pihl
- 👤 Hugh R Andrews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:04
CPC Classifications
F; F25; F25B; F25B49/00; F25B49/02; F25B49/022; F25B31/00; F25B31/02; Y; Y10; Y10S; Y10S417/00; Y10S417/902
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
IN A COMPRESSOR, THE COMBINATION OF A CASING, A COMPRESSION MECHANISM IN SAID CASING, MEANS IN SAID CASING FOR LUBRICATING THE COMPRESSION MECHANISM INCLUDING AN OIL SUMP, MOTOR OPERATIVELY ASSOCIATED WITH SAID COMPRESSION MECHANISM, SAID MOTOR HAVING A WINDING IN HEAT EXCHANGE RELATION WITH THE OIL SUMP, A SOURCE OF ELECTRICAL CURRENT, CIRCUIT MEANS INCLUDING A SWITCH COUPLING SAID MOTOR WINDING TO SAID SOURCE OF ELECTRICAL CURRENT CAUSING OPERATION OF SAID MOTOR WHEN SAID SWITCH IS CLOSED, AND A RESISTANCE IN HEAT EXCHANGE RELATION WITH SAID OIL SUMP, AND RESISTANCE BEING COUPLED ACROSS SAID SWITCH TO CAUSE A REDUCED VOLTAGE TO BE IMPRESSED ACROSS SAID MOTOR WINDING WHEN SAID SWITCH IS OPEN TO HEAT THE WINDING SO THAT THE HEAT WHICH IS PRODUCED BY BOTH THE WINDING AND THE RESISTANCE IS UTILIZED TO HEAT THE OIL SUMP TO SUBSTANTIALLY REDUCE DILUTION OF THE OIL WITH REFIRGERANT.
Claim 2
Dependent Claim
146 words
IN A COMPRESSOR, THE COMBINATION OF A CASING, A COMPRESSION MECHANISM IN SAID CASING, MEANS IN SAID CASING FOR LUBRICATING THE COMPRESSION MECHANISM INCLUDING AN OIL SUMP, MOTOR OPERATIVELY ASSOCIATED WITH SAID COMPRESSION MECHANISM, SAID MOTOR HAVING A WINDING IN HEAT EXCHANGE RELATION WITH THE OIL SUMP, A SOURCE OF ELECTRICAL CURRENT, CIRCUIT MEANS INCLUDING A SWITCH COUPLING SAID MOTOR WINDING TO SAID SOURCE OF ELECTRICAL CURRENT CAUSING OPERATION OF SAID MOTOR WHEN SAID SWITCH IS CLOSED, AND A RESISTANCE IN HEAT EXCHANGE RELATION WITH SAID OIL SUMP, AND RESISTANCE BEING COUPLED ACROSS SAID SWITCH TO CAUSE A REDUCED VOLTAGE TO BE IMPRESSED ACROSS SAID MOTOR WINDING WHEN SAID SWITCH IS OPEN TO HEAT THE WINDING SO THAT THE HEAT WHICH IS PRODUCED BY BOTH THE WINDING AND THE RESISTANCE IS UTILIZED TO HEAT THE OIL SUMP TO SUBSTANTIALLY REDUCE DILUTION OF THE OIL WITH REFIRGERANT.
References Cited (Backward Citations)
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US2107887A
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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) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |