US3889101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moist heating pad
Assignee: Battle Creek Equipment Co
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Filing: 1974-10-15
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Granted: 1975-06-10
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Expires: 1994-10-15
Abstract
Abstract An improved heating device such as a heating pad comprising a fabric base and insulated resistance wire mounted in said pad, preferably in a backward and forward sinuous pattern, at least one thermostat connected in series with the resistance wire element at both ends by means of lead wires of a low resistance metal such as copper, each thermostat being positioned intimately with a span or straight portion forming part of a sinuous loop of resistance wire, a switch connected in series with the resistance wire, and a plurality of bars of a metal such as lead mounted in the pad. In an improved embodiment the insulation on the resistance wire is formed of a plastic material able to withstand the elevated temperatures attained by the resistance wire during operation.
Inventors
- 👤 Thomas G Woods
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:38
CPC Classifications
A; A61; A61F; A61F7/00; A61F7/007; H; H05; H05B; H05B3/00; H05B3/10; H05B3/16; H05B3/20; H05B3/34; H05B3/342; A61F2007/0001; A61F2007/0086; H05B2203/00; H05B2203/002; H05B2203/003; H05B2203/014; H05B2203/017
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
170 words
A moist heating pad comprising: a. a flexible moisture permeable base sheet, b. an electrical resistance wire heating element having an insulation sleeve mounted on said flexible base in a pattern comprising a plurality of substantially parallel banks of backward and forward sinuous loops having straight portions substantially perpendicular to the longitudinal direction of said banks, c. at least one thermostat encased in an insulation jacket connected in series with said heating element and connected at both of its ends by insulated lead wires of a highly conductive metal, said thermostat being positioned parallel and in close proximity to a straight portion of one loop of said heating element, d. a plurality of strips of a water absorption lead alloy mounted on said flexible base sheet each within one of said sinuous loops, e. an electrical line cord having a switch therein being electrically connected to said heating element, and f. a flexible moisture permeable cover enclosing said flexible base sheet, said heating element, said metal strips and said thermostat.
Claim 2
Dependent Claim
170 words
A moist heating pad comprising: a. a flexible moisture permeable base sheet, b. an electrical resistance wire heating element having an insulation sleeve mounted on said flexible base in a pattern comprising a plurality of substantially parallel banks of backward and forward sinuous loops having straight portions substantially perpendicular to the longitudinal direction of said banks, c. at least one thermostat encased in an insulation jacket connected in series with said heating element and connected at both of its ends by insulated lead wires of a highly conductive metal, said thermostat being positioned parallel and in close proximity to a straight portion of one loop of said heating element, d. a plurality of strips of a water absorption lead alloy mounted on said flexible base sheet each within one of said sinuous loops, e. an electrical line cord having a switch therein being electrically connected to said heating element, and f. a flexible moisture permeable cover enclosing said flexible base sheet, said heating element, said metal strips and said thermostat.
Claim 3
Dependent Claim
20 words
A moist heating pad according to claim 1, wherein both the lead wires connected to said thermostat are of copper.
Claim 4
Dependent Claim
17 words
A moist heating pad according to claim 1, wherein said heating element is formed of nichrome wire.
Claim 5
Dependent Claim
21 words
A moist heating pad according to claim 1, wherein said insulation sleeve of said heater element is formed of silicone rubber.
Claim 6
Dependent Claim
18 words
A moist heating pad according to claim 1, wherein said thermostat is encased in a plastic heat-shrunk jacket.
Claim 7
Dependent Claim
24 words
A moist heating pad according to claim 5, wherein one of the lead wires connected to said thermostat is enclosed within said heat-shrunk jacket.
Claim 8
Dependent Claim
17 words
A moist heating pad according to claim 1, wherein said flexible base sheet is formed of fabric.
Claim 9
Dependent Claim
16 words
A moist heating pad according to claim 1, having a plurality of thermostats each similarly mounted.
Claim 10
Dependent Claim
24 words
A moist heating pad according to claim 1, having an inner cover within said outer cover, both of said covers being formed of fabric.
Claim 11
Dependent Claim
29 words
A moist heating pad according to claim 1, having a fabric strip covering each bank of sinuous loops, and affixed in place by turned-over ends of said metal strips.
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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) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |