US3133429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compressor crankcase heating device
Assignee: Carrier Corp
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Filing: 1957-11-01
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Granted: 1964-05-19
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Expires: 1977-11-01
Abstract
No abstract record available.
Inventors
- 👤 Maurice V Griffin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:47
CPC Classifications
F; F25; F25B; F25B31/00; F25B31/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
106 words
IN A COMPRESSOR, THE COMBINATION OF A COMPRESSION MECHANISM, MEANS OPERATIVELY ASSOCIATED WITH THE COMPRESSION MECHANISM FOR LUBRICATING THE COMPRESSION MECHANISM, SAID MEANS INCLUDING AN OIL SUMP, A SINGLE PHASE MOTOR CONNECTED TO SAID COMPRESSION MECHANISM AND BEING IN HEAT EXCHANGE RELATION WITH SAID SUMP, SAID MOTOR COMPRISING A FIRST CIRCUIT INCLUDING A RUN WINDING, A SECOND CIRCUIT IN PARALLEL WITH SAID FIRST CIRCUIT, SAID SECOND CIRCUIT HAVING A START WINDING IN SERIES WITH A CAPACITANCE, MEANS FOR PASSING LINE VOLTAGE ACROSS THE RUN WINDING, AND MEANS FOR PASSING LINE VOLTAGE ACROSS THE SECOND CIRCUIT WHEN THE PASSAGE OF CURRENT TO THE FIRST CIRCUIT IS DISCONTINUED.
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) | 1967-05-19 | 1967-11-18 | 1968-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-19 | 1971-11-18 | 1972-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-19 | 1975-11-18 | 1976-05-19 | $7700.00 | Window Closed / Lapsed |