Patent EP0665877A1 successfully refreshed from Google Patents.
US4180922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boot warmer
Assignee: Individual
•
Filing: 1978-02-07
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Granted: 1980-01-01
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Expires: 1998-02-07
Abstract
Abstract A boot warmer having a compact portable heater unit for burning solid fuel agglomerates. The heater unit includes a liquid reservoir in heat exchange relationship with the fuel agglomerates. A liquid conduit circulates the liquid throughout a boot or a boot liner by means of a hand manipulated pump. The heat exchanger or unit and pump are exposed and attached to the top of the boot, or in the case of a boot liner to the top of the boot liner, with the provision of means to attach the unit to the top outside of a boot casing.
Inventors
- 👤 Stanley Cieslak
- 👤 Leonard K. Cieslak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:18
CPC Classifications
A; A43; A43B; A43B7/00; A43B7/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
132 words
A footwear warmer comprising a portable compact heater unit including a compact insulated case having a cavity therein and adapted to be opened to receive slow burning solid fuel agglomerates in said cavity for combustion, a liquid reservoir in said case positioned for heat transfer from ignited fuel agglomerates in said cavity, a flexible liquid conduit having both ends thereof connected for circulation of the heated liquid from said reservoir through said conduit in a closed circuit adapted for circulation of heated liquid from said reservoir within a unit of footwear, pump means connected to said conduit for hand manipulation to circulate heated liquid from said reservoir through said conduit on demand, and means to secure said heater unit to a boot top with said pump manipulation means exposed for hand manipulation.
Claim 2
Dependent Claim
132 words
A footwear warmer comprising a portable compact heater unit including a compact insulated case having a cavity therein and adapted to be opened to receive slow burning solid fuel agglomerates in said cavity for combustion, a liquid reservoir in said case positioned for heat transfer from ignited fuel agglomerates in said cavity, a flexible liquid conduit having both ends thereof connected for circulation of the heated liquid from said reservoir through said conduit in a closed circuit adapted for circulation of heated liquid from said reservoir within a unit of footwear, pump means connected to said conduit for hand manipulation to circulate heated liquid from said reservoir through said conduit on demand, and means to secure said heater unit to a boot top with said pump manipulation means exposed for hand manipulation.
Claim 3
Dependent Claim
129 words
A boot and boot warmer combination comprising a portable compact heater unit including a compact insulated case having a cavity therein and adapted to be opened to receive a slow burning solid fuel agglomerate in said cavity for burning, a liquid reservoir in said case positioned for heat transfer from an ignited fuel agglomerate in said cavity, a boot, means to secure said heater unit to said boot at the top thereof, a liquid conduit circulating within said boot and having both ends thereof connected for circulation of heated liquid from said reservoir through said conduit in a closed circuit, pump means connected to said conduit and exposed adjacent the top of said boot for hand manipulation to circulate heated liquid from said reservoir through said conduit on demand.
Claim 4
Dependent Claim
129 words
A boot and boot warmer combination comprising a portable compact heater unit including a compact insulated case having a cavity therein and adapted to be opened to receive a slow burning solid fuel agglomerate in said cavity for burning, a liquid reservoir in said case positioned for heat transfer from an ignited fuel agglomerate in said cavity, a boot, means to secure said heater unit to said boot at the top thereof, a liquid conduit circulating within said boot and having both ends thereof connected for circulation of heated liquid from said reservoir through said conduit in a closed circuit, pump means connected to said conduit and exposed adjacent the top of said boot for hand manipulation to circulate heated liquid from said reservoir through said conduit on demand.
Claim 5
Dependent Claim
25 words
The boot and boot warmer combination of claim 2 wherein said boot consists of a boot liner for insertion into a water impervious boot casing.
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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) | 1982-12-31 | 1983-07-02 | 1984-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-31 | 1987-07-02 | 1988-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-31 | 1991-07-02 | 1992-01-01 | $7700.00 | Window Closed / Lapsed |