US3900654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite polymeric electric heating element
Assignee: EIDP Inc
•
Filing: 1972-12-11
•
Granted: 1975-08-19
•
Expires: 1992-12-11
Abstract
Abstract A laminated composite polymeric structure having beneficial utility as an electric heating element which is thin, flexible, and durable as well as efficient and safe to use can be made by forming an assembly of layers in which a film of electrically insulating polymeric material is in contact with at least one side of a layer of electrically conductive elastomeric material made by mixing a fluoroelastomer with a conductive carbon black, and having a suitable conductor means such as a strip of copper or aluminum in contact therewith for connection to a power supply, and then heating and pressing the assembly until the conductive elastomeric layer has suitable conductivity and adhesion to the insulating film.
Inventors
- 👤 Henry Joseph Stinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:32
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/36; B32B3/00; B32B3/02; F; F24; F24D; F24D13/00; F24D13/02; H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/146; B32B2307/00; B32B2307/20; B32B2307/202; B32B2311/00; B32B2311/12; B32B2367/00; B32B2457/00; Y; Y02; Y02B; Y02B30/00; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24959
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
11 words
A LAMINATED STRUCTURE USEFUL AS AN ELECTRIC HEATING ELEMENT WHICH COMPRISES
Claim 2
Dependent Claim
11 words
A LAMINATED STRUCTURE USEFUL AS AN ELECTRIC HEATING ELEMENT WHICH COMPRISES
Claim 3
Dependent Claim
65 words
A LAYER OF ELECTRICAL CONDUCTIVE ELASTOMERIC MATERIAL CONTAINING ELECTRICALLY CONDUCTIVE CARBON BLACK DISPERSED IN A FLUOROCARBON ELASTOMER, SAID LAYER HAVING A SPECIFIC RESISTIVITY OF ABOUT 0.1 -4 OHM CENTIMETERS. SAID FLUOROCARBON ELASTOMER BEING ELASTOMERIC COPLYMER OF VINYLIDENE FLUORIDE AND AT LEAST ONE OTHER FLUORINECONTAINING MONOMER. THE CONDUCTIVE CARBON BLACK CONTENT OF SAID LAYER BEING ABOUT 10-100 PARTS PER 100 PARTS BY WEIGHT OF SAID ELASTOMER,
Claim 4
Dependent Claim
65 words
A LAYER OF ELECTRICAL CONDUCTIVE ELASTOMERIC MATERIAL CONTAINING ELECTRICALLY CONDUCTIVE CARBON BLACK DISPERSED IN A FLUOROCARBON ELASTOMER, SAID LAYER HAVING A SPECIFIC RESISTIVITY OF ABOUT 0.1 -4 OHM CENTIMETERS. SAID FLUOROCARBON ELASTOMER BEING ELASTOMERIC COPLYMER OF VINYLIDENE FLUORIDE AND AT LEAST ONE OTHER FLUORINECONTAINING MONOMER. THE CONDUCTIVE CARBON BLACK CONTENT OF SAID LAYER BEING ABOUT 10-100 PARTS PER 100 PARTS BY WEIGHT OF SAID ELASTOMER,
Claim 5
Dependent Claim
15 words
A FILM OF ELECTRICALLY INSULATING POLYMERIC MATERIAL IN SUPERPOSED ADHERENT RELATION WITH LAYER (1), AND
Claim 6
Dependent Claim
15 words
A FILM OF ELECTRICALLY INSULATING POLYMERIC MATERIAL IN SUPERPOSED ADHERENT RELATION WITH LAYER (1), AND
Claim 7
Dependent Claim
15 words
a film of electrically insulating polymeric material in superposed adherent relation with layer (1), and
Claim 8
Dependent Claim
15 words
a film of electrically insulating polymeric material in superposed adherent relation with layer (1), and
Claim 9
Dependent Claim
68 words
A structure according to claim 1 wherein said conductive carbon black content is about 35-100 parts of acetylene black, the structure also contains (4) a film of electrically insulating polymeric material in adherent relation with the lower surface of layer (1), layer (1) has a thickness of about 0.05-5 mils, and the structure has the ability to produce about 10-60 watts of heat per square foot of product.
Claim 10
Dependent Claim
19 words
a conductor means in attached contact with layer (1) for electrically connecting the structure to an electric power supply.
Claim 11
Dependent Claim
19 words
a conductor means in attached contact with layer (1) for electrically connecting the structure to an electric power supply.
Claim 12
Dependent Claim
19 words
A CONDUCTOR MEANS IS ATTACHED CONTACT WITH LAYER (1) FOR ELECTRICALLY CONNECTING THE STRUCTURE TO AN ELECTRIC POWER SUPPLY.
Claim 13
Dependent Claim
19 words
A CONDUCTOR MEANS IS ATTACHED CONTACT WITH LAYER (1) FOR ELECTRICALLY CONNECTING THE STRUCTURE TO AN ELECTRIC POWER SUPPLY.
Claim 14
Dependent Claim
33 words
A structure according to claim 2 wherein layer (1) undergoes substantially no increase in specific resistivity when the structure is stored for a period of at least 6 months after it is made.
Claim 15
Dependent Claim
26 words
A structure according to claim 2 wherein the exterior surface of at least one of the insulating films has an adherent coating of a heat-absorbing material.
Claim 16
Dependent Claim
34 words
A structure according to claim 2 wherein each of the insulating films has a thickness of about 0.5 -15 mils, And the conductor means is bonded within the structure between the two insulating films.
Claim 17
Dependent Claim
25 words
A structure according to claim 5 wherein at least one of the insulating films is a polyester film, and component (3) is a metallic conductor.
Claim 18
Dependent Claim
32 words
A structure according to claim 6 wherein layer (1) has a thickness of about 0.05-0.45 mil, and the structure has a temperature coefficient of electrical resistance of about 0-0.01 per degree F.
Claim 19
Dependent Claim
45 words
A structure according to claim 6 wherein layer (1) is the adhesive which holds the two insulating films together, and there is a layer of said conductive elastomeric material in interposed adherence between at least one side of component (3) and the nearest insulating film.
Claim 20
Dependent Claim
29 words
A structure according to claim 6 wherein the laminated structure is capable of remaining useful as a heating element after being bent to a radius of about 1/8 inch.
Claim 21
Dependent Claim
109 words
A structure according to claim 6 wherein there is a layer of electrically conductive polyester adhesive in interposed adherent relation with at least one surface of the metallic conductor and the adjacent layer of the structure, said adhesive consisting essentially of a mixture of conductive carbon black and a linear copolyester which is the product of reacting a polymethylene glycol of 2-6 carbon atoms with about 20-60 mol percent (based on the total amount of acids) of terephthalic acid, about 15-50 mol percent of isophthalic acid and about 10-65 mol percent of at least one compound selected from the group: suberic, azelaic, sebacic and adipic acids and derivatives thereof.
Claim 22
Dependent Claim
43 words
A structure according to claim 10 wherein there is a layer of polyester adhesive in interposed adherent relation with at least one of the insulating films and the conductive elastomer layer, said adhesive consisting essentially of the linear copolyester defined in claim 10.
Claim 23
Dependent Claim
19 words
A structure according to claim 11 wherein each of said adhesive layers has a thickness of about 0.03-0.15 mil.
Claim 24
Dependent Claim
98 words
A structure according to claim 11 wherein top and bottom insulating films 2 and 4 consist essentially of poly(ethylene terephthalate); conductor component 3 is at least one strip of metal in interposed adherent relation with elastomer layer 1 and bottom film 4; said conductive polyester adhesive layer is in interposed adherent relation with the top surface of conductor 3 and elastomer layer 1; and there is a layer of polyester adhesive in interposed adherent relation with the bottom surface of conductor 3 and bottom film 4, said adhesive consisting essentially of the linear copolyester defined in claim 10.
References Cited (Backward Citations)
US2498493A
Cited
US2643206A
Cited
US2688070A
Cited
US2892747A
Cited
US2955974A
Cited
US3325344A
Cited
US3385959A
Cited
US3398233A
Cited
US3484337A
Cited
US3645834A
Cited
US3597591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |