US3282065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Defroster control for refrigeration apparatus
Assignee: Texas Instruments Inc
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Filing: 1965-06-24
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Granted: 1966-11-01
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Expires: 1985-06-24
Abstract
No abstract record available.
Inventors
- 👤 Charles D Flanagan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:44
CPC Classifications
F; F25; F25D; F25D21/00; F25D21/002; F25D21/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A CONTROL FOR REFRIGERATION APPARATUS HAVING COOLING MEANS FOR ABSORBING HEAT FROM A REFRIGERATED ZONE, SAID COOLING MEANS BEING SUBJECT TO FROST BUILDUP, AND DEFROST MEANS ADAPTED WHEN ENERGIZED TO REMOVE FROST FROM SAID COOLING MEANS, SAID CONTROL COMPRISING: ELECTRODE MEANS ADAPTED TO BE POSITIONED ADJACENT SAID COOLING MEANS TO CONSTITUTE THEREWITH A CAPACITOR HAVING A CAPACITANCE WHICH VARIES WITH FROST BUILDUP; MEANS INTERCONNECTED WITH SAID CAPACITOR AND FORMING THEREWITH A TUNED CIRCUIT; AN OSCILLATOR CIRCUIT INCORPORATING SAID TUNED CIRCUIT FOR PROVIDING AN A.C. SIGNAL THE FREQUENCY OF WHICH IS CONTROLLED BY SAID TUNED CIRCUIT AND VARIES WITH FROST BUILDUP; AND MEANS, RESPONSIVE TO SUCH VARIATIONS IN SAID A.C. SIGNAL BEYOND A PRESELECTED LIMIT, FOR ENERGIZING SAID DEFROST MEANS WHEREBY, WHEN FROST BUILDS UP ON SAID COOLING MEANS BEYOND A PRESELECTED LEVEL, SAID DEFROST MEANS IS AUTOMATICALLY ENERGIZED TO REMOVE THE FROST.
Claim 2
Dependent Claim
142 words
A CONTROL FOR REFRIGERATION APPARATUS HAVING COOLING MEANS FOR ABSORBING HEAT FROM A REFRIGERATED ZONE, SAID COOLING MEANS BEING SUBJECT TO FROST BUILDUP, AND DEFROST MEANS ADAPTED WHEN ENERGIZED TO REMOVE FROST FROM SAID COOLING MEANS, SAID CONTROL COMPRISING: ELECTRODE MEANS ADAPTED TO BE POSITIONED ADJACENT SAID COOLING MEANS TO CONSTITUTE THEREWITH A CAPACITOR HAVING A CAPACITANCE WHICH VARIES WITH FROST BUILDUP; MEANS INTERCONNECTED WITH SAID CAPACITOR AND FORMING THEREWITH A TUNED CIRCUIT; AN OSCILLATOR CIRCUIT INCORPORATING SAID TUNED CIRCUIT FOR PROVIDING AN A.C. SIGNAL THE FREQUENCY OF WHICH IS CONTROLLED BY SAID TUNED CIRCUIT AND VARIES WITH FROST BUILDUP; AND MEANS, RESPONSIVE TO SUCH VARIATIONS IN SAID A.C. SIGNAL BEYOND A PRESELECTED LIMIT, FOR ENERGIZING SAID DEFROST MEANS WHEREBY, WHEN FROST BUILDS UP ON SAID COOLING MEANS BEYOND A PRESELECTED LEVEL, SAID DEFROST MEANS IS AUTOMATICALLY ENERGIZED TO REMOVE THE FROST.
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) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |