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Patent US4919744A successfully refreshed from Google Patents.
US4919744A
Expired / Lapsed
US
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Method of making a flexible heater comprising a conductive polymer
Assignee: Raychem Corp
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Filing: 1988-09-30
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Granted: 1990-04-24
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Expires: 2008-09-30
Abstract
Abstract A flexible and rugged laminar heater in which a non-woven cloth layer serves to reduce air void formation during lmaination. The heater of the invention comprises a laminar conductive polymer heating element, at least two electrodes, at least one polymeric insulating layer and at least one nonwoven cloth layer. Suitable nonwoven cloths may comprise nylon or glass. In addition to eliminating air voids, they are useful in minimizing distortion of the laminate.
Inventors
- 👤 Keith G. Newman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:55
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/02; H01C7/027; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/146; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1089; Y10T156/1092; Y10T156/1093; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49083
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
114 words
A method of laminating layers to form a heater comprising a conductive polymer heating element, said method comprising (A) positioning a layer of nonwoven cloth between (1) a first layer which (a) comprises a laminar heating element which exhibits PTC behavior and which comprises a conductive polymer composition and (b) further comprises at least two electrodes which are positioned so that when current passes between the electrodes a substantial proportion of the current through the laminar element is parallel to the faces of the laminar element and (2) a second layer which comprises a polymeric insulating material; and (B) exposing the layers to sufficient temperature and pressure to achieve a bond between the layers.
Claim 2
Independent Claim
114 words
A method of laminating layers to form a heater comprising a conductive polymer heating element, said method comprising (A) positioning a layer of nonwoven cloth between (1) a first layer which (a) comprises a laminar heating element which exhibits PTC behavior and which comprises a conductive polymer composition and (b) further comprises at least two electrodes which are positioned so that when current passes between the electrodes a substantial proportion of the current through the laminar element is parallel to the faces of the laminar element and (2) a second layer which comprises a polymeric insulating material; and (B) exposing the layers to sufficient temperature and pressure to achieve a bond between the layers.
Claim 3
Dependent Claim
21 words
A method according to claim 1 wherein the temperature of lamination is less than the melting point of the nonwoven cloth.
Claim 4
Dependent Claim
18 words
A method according to claim 1 wherein the first layer further comprises a layer of polymeric insulating material.
Claim 5
Dependent Claim
29 words
A method according to claim 1 wherein the electrodes are positioned on the same surface of the laminar heating element and the nonwoven cloth is adjacent to the electrodes.
Claim 6
Dependent Claim
17 words
A method according to claim 3 wherein the nonwoven cloth is in contact with two insulating layers.
Claim 7
Dependent Claim
12 words
A method according to claim 1 wherein the nonwoven cloth comprises nylon.
Claim 8
Dependent Claim
12 words
A method according to claim 1 wherein the nonwoven cloth comprises glass.
Claim 9
Dependent Claim
12 words
A method according to claim 1 wherein the electrodes comprise electrodeposited metal.
Claim 10
Dependent Claim
18 words
A method according to claim 1 wherein the nonwoven cloth has a thickness of less than 0.015 inch.
Claim 11
Dependent Claim
18 words
A method according to claim 6 wherein the nonwoven cloth has a thickness of 0.005 to 0.010 inch.
Claim 12
Dependent Claim
18 words
A method according to claim 7 wherein the nonwoven cloth has a thickness of 0.001 to 0.015 inch.
Claim 13
Dependent Claim
20 words
A method according to claim 6 wherein the nonwoven cloth has a weight of 0.005 to 1.0 oz/yd 2 .
Claim 14
Dependent Claim
20 words
A method according to claim 7 wherein the nonwoven cloth has a weight of 0.4 to 0.2 oz/yd 2 .
Claim 15
Dependent Claim
22 words
A method according to claim 1 wherein the nonwoven cloth has a permeability to air of at least 500 CFM/ft 2 .
References Cited (Backward Citations)
US4177376A
Cited
US4654511A
Cited
US4330703A
Cited
US4177446A
Cited
US4304987A
Cited
US4318220A
Cited
US4223209A
Cited
US4543474A
Cited
US4317027A
Cited
US4426633A
Cited
US4719335A
Cited
US4761541A
Cited
US4777351A
Cited
US4689475A
Cited
US4800253A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-23 | 1993-10-23 | 1994-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-23 | 1997-10-23 | 1998-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-23 | 2001-10-23 | 2002-04-24 | $7700.00 | Window Closed / Lapsed |