US3311906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigerator monitoring system
Assignee: REF CON CORP
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Filing: 1964-08-17
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Granted: 1967-03-28
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Expires: 1984-08-17
Abstract
No abstract record available.
Inventors
- 👤 William E Coffer
- 👤 Robert L Miller
- 👤 Shewan John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:03
CPC Classifications
F; F25; F25D; F25D21/00; F25D21/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
IN A MONITORING SYSTEM FOR A REFRIGERATOR EQUIPPED WITH DEFROSTING MEANS, A FIRST CIRCUIT INCLUDING A WARNING DEVICE FOR REPORTING A REFRIGERATOR INTERIOR TEMPERATURE IN EXCESS OF A PREDETERMINED VALUE, A SECOND CIRCUIT INCLUDING A RELAY AND MEANS FOR OPERATING SAID RELAY TO RENDER SAID WARNING DEVICE INOPERATIVE DURING DEFROSTING, AND A THIRD CIRCUIT INCLUDING MEANS RESPONSIVE TO FAULTY OPERATION OF SAID REFRIGERATOR DURING DEFROSTING FOR INDICATING SAID FAULTY OPERATION, SAID SECOND CIRCUIT RELAY INCLUDING MEANS FOR RENDERING SAID THIRD CIRCUIT OPERATIVE ONLY DURING DEFROSTING THEREBY PRECLUDING SIMULTANEOUS OPERATION OF SAID FIRST AND THIRD CIRCUITS IN ACTUATING SAID WARNING DEVICE.
Claim 2
Dependent Claim
100 words
IN A MONITORING SYSTEM FOR A REFRIGERATOR EQUIPPED WITH DEFROSTING MEANS, A FIRST CIRCUIT INCLUDING A WARNING DEVICE FOR REPORTING A REFRIGERATOR INTERIOR TEMPERATURE IN EXCESS OF A PREDETERMINED VALUE, A SECOND CIRCUIT INCLUDING A RELAY AND MEANS FOR OPERATING SAID RELAY TO RENDER SAID WARNING DEVICE INOPERATIVE DURING DEFROSTING, AND A THIRD CIRCUIT INCLUDING MEANS RESPONSIVE TO FAULTY OPERATION OF SAID REFRIGERATOR DURING DEFROSTING FOR INDICATING SAID FAULTY OPERATION, SAID SECOND CIRCUIT RELAY INCLUDING MEANS FOR RENDERING SAID THIRD CIRCUIT OPERATIVE ONLY DURING DEFROSTING THEREBY PRECLUDING SIMULTANEOUS OPERATION OF SAID FIRST AND THIRD CIRCUITS IN ACTUATING SAID WARNING DEVICE.
References Cited (Backward Citations)
US3136137A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-27 | 1970-09-26 | 1971-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-27 | 1974-09-26 | 1975-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-27 | 1978-09-26 | 1979-03-28 | $7700.00 | Window Closed / Lapsed |