Patent US3930951A successfully refreshed from Google Patents.
Patent US3120108A successfully refreshed from Google Patents.
US3120108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigerating apparatus including defrost control
Assignee: Motors Liquidation Co
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Filing: 1961-03-30
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Granted: 1964-02-04
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Expires: 1981-03-30
Abstract
No abstract record available.
Inventors
- 👤 Fred L Pansing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:15
CPC Classifications
F; F25; F25D; F25D21/00; F25D21/02; F25B; F25B2700/00; F25B2700/11; F25B2700/111
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
93 words
IN A REFRIGERATING SYSTEM, AN EVAPORATOR, MEANS FOR SUPPLYING REFRIGERANT TO SAID EVAPORATOR, SAID EVAPORATOR HAVING A PLURALITY OF FINS, A PLURALITY OF ALIGNED APERTURES IN SAID FINS IN AN AREA WHERE THE FROST TENDS TO ACCUMULATE ON SAID EVAPORATOR, MEANS FOR FORCEFULLY CIRCULATING AIR THROUGH SAID EVAPORATOR BETWEEN SAID FINS, A LIGHT SOURCE DIRECTING LIGHT THROUGH SAID APERTURES, AND LIGHT SENSITIVE MEANS RESPONSIVE TO BLOCKAGE OF SAID APERTURES BY FROST IN SAID APERTURES FOR CONTROLLING THE SUPPLY OF REFRIGERANT TO SAID EVAPORATOR, SAID LAST NAMED MEANS COMPRISING A SILICON CONTROLLED RECTIFIER MEANS.
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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) | 1967-02-03 | 1967-08-05 | 1968-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-03 | 1971-08-05 | 1972-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-03 | 1975-08-05 | 1976-02-04 | $7700.00 | Window Closed / Lapsed |