US4044221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible heating element for heating seats, in particular motor vehicle seats, couches, berths or the like
Assignee: WARMETECHNIK B RUTHENBERG GmbH KG
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Filing: 1975-05-15
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Granted: 1977-08-23
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Expires: 1995-05-15
Abstract
Abstract A flexible electrical heating element includes a resistance heater which defines a seam, particularly a zig-zag seam, supported on an air-permeable, flexible, flat plane-like carrier. The carrier, is fastened by means of closing-seams to a perforated plastic foam web. The heating element is suitable for use in heating seats or couches in motor vehicles and the like.
Inventors
- 👤 Gerald Kuhn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:36
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/34; H05B3/342; H05B2203/00; H05B2203/002; H05B2203/004; H05B2203/014; H05B2203/017; H05B2203/029
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
76 words
A flexible electrical heating element comprising: a planar carrier sheet, said carrier sheet being formed of an air permeable material; an electrical heater, said heater being in the form of a conductive wire which defines a seam on said carrier sheet; a perforated foam member, said foam member having a first side facing a first side of said carrier sheet; and means mechanically interconnecting said carrier sheet and foam member, said interconnecting means including closing seams.
Claim 2
Dependent Claim
76 words
A flexible electrical heating element comprising: a planar carrier sheet, said carrier sheet being formed of an air permeable material; an electrical heater, said heater being in the form of a conductive wire which defines a seam on said carrier sheet; a perforated foam member, said foam member having a first side facing a first side of said carrier sheet; and means mechanically interconnecting said carrier sheet and foam member, said interconnecting means including closing seams.
Claim 3
Dependent Claim
15 words
The heating element of claim 1 wherein said heater conductive wire defines a zig-zag seam.
Claim 4
Dependent Claim
37 words
The heating element of claim 2 further comprising: a first air permeable woven fabric web, said first fabric web being laminated with said carrier sheet and being disposed between said carrier sheet and said perforated foam member.
Claim 5
Dependent Claim
41 words
The heating element of claim 3 further comprising: a second air permeable woven fabric web, said second fabric web being laminated with said carrier sheet and being disposed on the opposite side of said carrier sheet from said first fabric web.
Claim 6
Dependent Claim
29 words
The heating element of claim 4 further comprising: a perforated plastic foil layer, said plastic foil layer being in contact with the second side of said perforated foam member.
Claim 7
Dependent Claim
31 words
The heating element of claim 5 wherein said foam member is compressed in the vicinity of said interconnecting means closing seams whereby said closing seams define indentations in said heating element.
Claim 8
Dependent Claim
20 words
The heating element of claim 1 wherein said interconnecting means closing seams extend substantially between said conductive wire defined seams.
Claim 9
Dependent Claim
18 words
The heating element of claim 1 wherein said planar carrier sheet is comprised of a woven fabric web.
Claim 10
Dependent Claim
29 words
The heating element of claim 1 further comprising: a perforated plastic foil layer, said plastic foil layer being in contact with the second side of said perforated foam member.
Claim 11
Dependent Claim
29 words
The heating element of claim 3 further comprising: a perforated plastic foil layer, said plastic foil layer being in contact with the second side of said perforated foam member.
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) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |