Patent US3973422A successfully refreshed from Google Patents.
US3973422A
Expired / Lapsed
US
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Defroster key case
Assignee: Lawrence Peska Associates Inc
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Filing: 1975-02-11
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Granted: 1976-08-10
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Expires: 1995-02-11
Abstract
Abstract A key case which includes a battery and a coil disposed in coaxial relationship with respect to a swivel pin for carrying keys. A switch selectively connects the battery and the coil for heating of the keys to assist in insertion thereof into locks which may be frozen.
Inventors
- 👤 Frank Cervera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:53
CPC Classifications
A; A45; A45C; A45C11/00; A45C11/32; A45C11/321; A45C11/324; Y; Y10; Y10T; Y10T70/00; Y10T70/80; Y10T70/8432; Y10T70/8676
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
In a key case having a pair of opposed sidewalls and a pin extending between said sidewalls, said pin being of a diameter for rotatably and slideably carrying keys thereon, the improvement comprising: a heater coil wrapped about said pin in heat transfer relationship therewith; a battery within said case; and switch means carried by said case in a series circuit with said battery and said heater coil.
Claim 2
Dependent Claim
68 words
In a key case having a pair of opposed sidewalls and a pin extending between said sidewalls, said pin being of a diameter for rotatably and slideably carrying keys thereon, the improvement comprising: a heater coil wrapped about said pin in heat transfer relationship therewith; a battery within said case; and switch means carried by said case in a series circuit with said battery and said heater coil.
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) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |