US3757087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating elements
Assignee: Smiths Group PLC
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Filing: 1971-03-08
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Granted: 1973-09-04
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Expires: 1991-03-08
Abstract
Abstract Heater assembly that may be used for heating a surface such as the glass rear windscreen (or window) of a motor vehicle comprises a heater element having a continuous metal strip of sinuous form. The element is sandwiched between two paper backing sheets which are adhesively secured to opposed surfaces of the metal strip. A first backing sheet is for removal prior to the mounting of the element on an automobile rear windscreen, and the other backing sheet is to be removed after the element has been so mounted. The first backing sheet is coated with a silicone or wax to facilitate its ready removal from the element. The surface of the element covered by the other backing paper is provided with a layer of electrically insulating material.
Inventors
- 👤 D Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:13
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/84; H01; H01R; H01R4/00; H01R4/02; H05B3/02; H05B3/06; H05B3/20; H05B3/22; H05B3/26; H05B3/40; H05B3/54; H05B3/56; H05B3/565; H05B2203/00; H05B2203/014; H05B2203/016
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
320 words
A heater assembly comprising a deformable electrical heating element which is to be adhesively secured to a surface to be heated and which has a plurality of limbs planarly disposed in spaced array, the heating element array having a continuous strip of electrically resistive material, two ends, and first and second opposed surfaces; two terminals electrically connected to said two ends of the heating element array respectively; a detachable covering layer; a first adhesive coating on the first surface of said strip for detachably adhering said covering layer to said first surface of the heating element array, the said covering layer being detachable from the heating element array prior to the mounting of said array on said surface; a detachable supporting layer; and a second adhesive coating in direct contact with said second surface for detachably adhering said supporting layer to said second surface of the heating element array to provide a predetermined level of adhesion therebetween, the said supporting layer being the sole support for maintaining the spatial relationship between the limbs of said heating element array after said covering layer has been detached, and said supporting layer being detachable from the heating element array after its mounting on said surface; the surface of said covering layer facing said first surface of the heating element array being a low-cohesion surface cooperating with said first adhesive coating to provide a level of adhesion between said covering layer and the first adhesive coating which is substantially less than the said predetermined level of adhesion between the said supporting layer and the second surface of the heating element array to enable the said covering layer to be detached from said heating element array more readily than the said supporting layer, whereby said first adhesive coating is exposed thereby to permit the heating element array, while supported by said supporting layer, to be adhesively secured to said surface by said first adhesive coating.
Claim 2
Dependent Claim
320 words
A heater assembly comprising a deformable electrical heating element which is to be adhesively secured to a surface to be heated and which has a plurality of limbs planarly disposed in spaced array, the heating element array having a continuous strip of electrically resistive material, two ends, and first and second opposed surfaces; two terminals electrically connected to said two ends of the heating element array respectively; a detachable covering layer; a first adhesive coating on the first surface of said strip for detachably adhering said covering layer to said first surface of the heating element array, the said covering layer being detachable from the heating element array prior to the mounting of said array on said surface; a detachable supporting layer; and a second adhesive coating in direct contact with said second surface for detachably adhering said supporting layer to said second surface of the heating element array to provide a predetermined level of adhesion therebetween, the said supporting layer being the sole support for maintaining the spatial relationship between the limbs of said heating element array after said covering layer has been detached, and said supporting layer being detachable from the heating element array after its mounting on said surface; the surface of said covering layer facing said first surface of the heating element array being a low-cohesion surface cooperating with said first adhesive coating to provide a level of adhesion between said covering layer and the first adhesive coating which is substantially less than the said predetermined level of adhesion between the said supporting layer and the second surface of the heating element array to enable the said covering layer to be detached from said heating element array more readily than the said supporting layer, whereby said first adhesive coating is exposed thereby to permit the heating element array, while supported by said supporting layer, to be adhesively secured to said surface by said first adhesive coating.
Claim 3
Dependent Claim
35 words
The heater assembly of claim 1 wherein the said limbs of the heating element array extend parallel to one another, the spacing between said limbs being substantially greater than the width of each said limb.
Claim 4
Dependent Claim
44 words
The heater assembly of claim 1 wherein said heating element array includes a strip of electrically insulating material bonded in surface contact and covering only said continuous strip of electrically resistive material, said insulating strip forming said second surface of said heating element array.
Claim 5
Dependent Claim
17 words
The heater assembly of claim 1 wherein said heating element array follows a path of sinuous form.
Claim 6
Dependent Claim
15 words
The heater assembly of claim 1 wherein said first adhesive coating comprises a thermo-setting adhesive.
Claim 7
Dependent Claim
18 words
The heater assembly of claim 1 wherein the low-cohesion surface of said covering layer is a polished surface.
Claim 8
Dependent Claim
33 words
The heater assembly of claim 1 wherein said low-cohesion surface of said covering layer comprises a low-cohesion coating on the surface of said covering layer facing said first surface of the heating element.
Claim 9
Dependent Claim
248 words
A heater assembly comprising an electrical heating element which is to be adhesively secured to a surface to be heated, said heating element comprising a continuous strip of electrically resistive metallic foil material having a plurality of spaced foil portions electrically connected to one another and arranged in a predetermined pattern, said heating element pattErn having first and second opposed surfaces; electrical terminal means connected to said heating element pattern; a detachable covering layer; a first coating of bonding material on the first surface of said heating element pattern for detachably adhering the said covering layer to said first surface of the heating element pattern, the said covering layer being detachable from the heating element pattern prior to its mounting on said surface; a detachable supporting layer; a second coating of bonding material in direct contact with the second surface of said pattern for detachably adhering the supporting layer to said second surface of the heating element pattern, the said supporting layer comprising the sole support for maintaining the configuration of said heating element pattern after said covering layer has been detached, and said supporting layer being detachable from the heating element pattern after its mounting on said surface; the surface of said covering layer facing said first surface of the heating element pattern cooperating with said first coating of bonding material to provide a level of adhesion therebetween which is lower than the level of adhesion between said supporting layer and the second coating of bonding material.
Claim 10
Dependent Claim
248 words
A heater assembly comprising an electrical heating element which is to be adhesively secured to a surface to be heated, said heating element comprising a continuous strip of electrically resistive metallic foil material having a plurality of spaced foil portions electrically connected to one another and arranged in a predetermined pattern, said heating element pattErn having first and second opposed surfaces; electrical terminal means connected to said heating element pattern; a detachable covering layer; a first coating of bonding material on the first surface of said heating element pattern for detachably adhering the said covering layer to said first surface of the heating element pattern, the said covering layer being detachable from the heating element pattern prior to its mounting on said surface; a detachable supporting layer; a second coating of bonding material in direct contact with the second surface of said pattern for detachably adhering the supporting layer to said second surface of the heating element pattern, the said supporting layer comprising the sole support for maintaining the configuration of said heating element pattern after said covering layer has been detached, and said supporting layer being detachable from the heating element pattern after its mounting on said surface; the surface of said covering layer facing said first surface of the heating element pattern cooperating with said first coating of bonding material to provide a level of adhesion therebetween which is lower than the level of adhesion between said supporting layer and the second coating of bonding material.
Claim 11
Dependent Claim
39 words
The heater assembly of claim 8 wherein said heating element pattern includes a plurality of limbs disposed in spaced parallel relation to one another, the spacing between said limbs being greater than the width of each of said limbs.
Claim 12
Dependent Claim
41 words
The heater assembly of claim 8 including a strip of electrically insulating material bonded to said strip of electrically resistive foil material in a pattern which corresponds to said predetermined pattern to form said second surface of the heating element pattern.
Claim 13
Dependent Claim
73 words
The heater assembly of claim 9 wherein said electrical terminal means comprises a pair of spaced electrical terminals connected to spaced portions of said metallic foil material, each of said terminal means comprising two metallic members having one of said spaced portions of metallic foil material sandwiched therebetween, one of said metallic members having a pair of side edges which are turned inwardly to retain the other of said metallic members in place.
Claim 14
Dependent Claim
34 words
The heater assembly of claim 8 wherein at least one of said detachable layers is in the form of a strip which is essentially coextensive with said strip of electrically resistive metallic foil material.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |