Patent US2917197A successfully refreshed from Google Patents.
US3553975A
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Refrigerator temperature and defrosting control
Assignee: Sanyo Electric Co Ltd
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Filing: 1968-08-07
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Granted: 1971-01-12
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Expires: 1988-08-07
Abstract
Abstract TEMPERATURE AND DEFROSTING CONTROL APPARATUS IS DESCRIBED INCLUDING A CIRCUIT FOR CONTROLLING THE OPERATION OF THE REFRIGERATOR COMPRESSOR IN RESPONSE TO TEMPERATURE SIGNALS FROM ONE OR MORE THERMOSENSITIVE RESISTANCE ELEMENTS DISPOSED AT LOCATIONS WITHIN THE REFRIGERATING AND FREEZING CHAMBERS AND A DEFROSTING CONTROL CIRCUIT FOR INITIATING THE DEFROSTING CYCLE IN RESPONSE TO A TIMING DEVICE AND TERMINATING THE DEFROSTING CYCLE IN RESPONSE TO TEMPERATURE SIGNALS FROM ONE OR MORE OF THE THERMOSENSITIVE RESISTANCE ELEMENTS.
Inventors
- 👤 Yoshiyasu Sakamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:51
CPC Classifications
F; F25; F25D; F25D21/00; F25D21/002; F25D21/006; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/1909; G05D23/1927; G05D23/20; G05D23/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |