US3135100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for preventing freeze-up of refrigerator doors
Assignee: Individual
•
Filing: 1961-10-23
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Granted: 1964-06-02
•
Expires: 1981-10-23
Abstract
No abstract record available.
Inventors
- 👤 Thomas D Taylor
- 👤 Fortescue W Hopkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:57
CPC Classifications
F; F25; F25D; F25D21/00; F25D21/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
APPARATUS FOR PREVENTING THE FORMATION OF ICE AND FROST ABOUT THE JUNCTION OF DOORWAY MEMBERS INCLUDING A DOOR LEADING INTO A REFRIGERATED COMPARTMENT AND THE FRAME THEREOF, SAID APPARATUS COMPRISING A CONTINUOUS ELECTRICALLY UNISULATED CONDUCTIVE STRIP MOUNTED UPON THE EXTERIOR SURFACE OF AT LEAST ONE OF SAID DOORWAY MEMBERS ALONG A SUBSTANTIAL LENGTH OF THE DOORWAY PERIPHERY AND IN CLOSE PROXIMITY TO THE CLOSURE ZONE BETWEEN THE DOOR AND FRAME WHEREAT FREEZING OF WATER FROM THE AIR TENDS TO OCCUR AS WARM AIR MOVES PAST THE DOOR INTO THE COMPARTMENT, A SOURCE OF ELECTRIC CURRENT, AND MEANS CONNECTING THE ENDS OF SAID STRIP TO SAID SOURCE, THE VOLTAGE OF THE SOURCE BEING RELATED TO THE ELECTRICAL RESISTANCE OF THE CLOSED CIRCUIT FORMED BY THE STRIP AND CONNECTING MEANS SO THAT THE MAXIMUM VOLTAGE ACROSS ANY TWO POINTS OF THE UNINSULATED PORTION OF SAID CIRCUIT IS LESS THAN APPROXIMATELY 25 VOLTS, AND THE SOURCE HAVING CAPACITY TO DRIVE CURRENT THROUGH SAID STRIP IN AMOUNT SUFFICIENT TO HEAT SAME SUFFICIENTLY TO PREVENT FREEZING OF WATER IN SAID CLOSURE ZONE.
Claim 2
Dependent Claim
177 words
APPARATUS FOR PREVENTING THE FORMATION OF ICE AND FROST ABOUT THE JUNCTION OF DOORWAY MEMBERS INCLUDING A DOOR LEADING INTO A REFRIGERATED COMPARTMENT AND THE FRAME THEREOF, SAID APPARATUS COMPRISING A CONTINUOUS ELECTRICALLY UNISULATED CONDUCTIVE STRIP MOUNTED UPON THE EXTERIOR SURFACE OF AT LEAST ONE OF SAID DOORWAY MEMBERS ALONG A SUBSTANTIAL LENGTH OF THE DOORWAY PERIPHERY AND IN CLOSE PROXIMITY TO THE CLOSURE ZONE BETWEEN THE DOOR AND FRAME WHEREAT FREEZING OF WATER FROM THE AIR TENDS TO OCCUR AS WARM AIR MOVES PAST THE DOOR INTO THE COMPARTMENT, A SOURCE OF ELECTRIC CURRENT, AND MEANS CONNECTING THE ENDS OF SAID STRIP TO SAID SOURCE, THE VOLTAGE OF THE SOURCE BEING RELATED TO THE ELECTRICAL RESISTANCE OF THE CLOSED CIRCUIT FORMED BY THE STRIP AND CONNECTING MEANS SO THAT THE MAXIMUM VOLTAGE ACROSS ANY TWO POINTS OF THE UNINSULATED PORTION OF SAID CIRCUIT IS LESS THAN APPROXIMATELY 25 VOLTS, AND THE SOURCE HAVING CAPACITY TO DRIVE CURRENT THROUGH SAID STRIP IN AMOUNT SUFFICIENT TO HEAT SAME SUFFICIENTLY TO PREVENT FREEZING OF WATER IN SAID CLOSURE ZONE.
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) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |