US3107499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control apparatus
Assignee: Honeywell Inc
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Filing: 1961-09-22
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Granted: 1963-10-22
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Expires: 1981-09-22
Abstract
No abstract record available.
Inventors
- 👤 Veikko J Jokela
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:35
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/001; F24F5/00; F24F5/0007; F24F5/001; F25; F25B; F25B13/00; F25B47/00; F25B47/02; F25B47/022; F25B47/025; F25D; F25D21/00; F25D21/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
120 words
IN A DEFROST CONTROL FOR A REFRIGERATION SYSTEM OBTAINING HEAT BY FORCING OUTDOOR AIR WITH A FAN THROUGH A HEAT EXCHANGER, SAID EXCHANGER COLLECTING FROST UNDER CERTAIN CONDITIONS TO BLOCK THE FLOW OF AIR THERETHROUGH, A CONDUIT MOUNTED IN THERMAL RELATION ON SAID EXCHANGER IN A PASSAGEWAY THERETHROUGH, SAID CONDUIT HAVING AN OPENING IN SAID PASSAGEWAY WHICH IS RESTRICTED BY FROST TO REDUCE AIR FLOW THROUGH SAID CONDUIT WHEN FROST FORMS ON SAID EXCHANGER, SAID PASSAGEWAY PRODUCTING SUCTION ON SAID OPENING OF SAID CONDUIT AS AIR PASSES THROUGH SAID HEAT EXCHANGER, AND RESPONSIVE MEANS MEANS CONNECTED TO SAID CONDUIT TO RESPOND TO A REDUCTION OF AIR FLOW THROUGH SAID CONDUIT, SAID RESPONSIVE MEANS CONTROLLING A DEFROST CYCLE FOR SAID EXCHANGER.
References Cited (Backward Citations)
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Cited
US2969959A
Cited
US2928255A
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US3004399A
Cited
US2975611A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-10-21 | 1967-04-22 | 1967-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-21 | 1971-04-22 | 1971-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-21 | 1975-04-22 | 1975-10-22 | $7700.00 | Window Closed / Lapsed |