US3621670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricating oil equalizing system
Assignee: Copeland Industrial LP
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Filing: 1970-01-12
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Granted: 1971-11-23
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Expires: 1990-01-12
Abstract
Abstract AN OIL LEVEL EQUALIZING SYSTEM INTERCONNECTING THE COMPRESSOR CRANKCASES FOR A MULTI-COMPRESSOR REFRIGERATION SYSTEM TO MAINTAIN AN EQUAL LEVEL OF OIL IN THE CRANKCASE OF EACH OF THE COMPRESSOR. THE OIL LEVEL CONTROL SYSTEM INCLUDES A BYPASS LINE CONNECTING THE OUTLET OF THE LUBRICATING PUMP ON EACH COMPRESOR TO THE CRANKCASE OF AN ADJOINING COMPRESSOR ADN A LIQUID LEVEL OPERATED VALVE RESPONSIVE TO THE LEVEL OF OIL IN THE ADJOINING CRANKCASE TO CONTROL THE ADMISSION OF OIL FROM THE LUBRICATING PUMP. THE LIQUID LEVEL OPERATED VALVE CAN BE CONTROLLED BY A FLOAT DIRECTLY CONNECTED TO OPEN THE VALVE OR BY A FLOAT SWITCH CONNECTED TO ASOLENOID VALVE LOCATED IN THE BYPASS LINE.
Inventors
- 👤 Raymond W Kinney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:42
CPC Classifications
F; F16; F16N; F16N19/00; F16N19/006; F01; F01M; F01M11/00; F01M11/06; F01M11/061; F25; F25B; F25B31/00; F25B31/002; F16N2250/00; F16N2250/18; F16N2270/00; F16N2270/10; F16N2270/14; F25B2400/00; F25B2400/07; F25B2400/075
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |