US4833305A
Expired / Lapsed
US
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Thermally self-regulating elastomeric composition and heating element utilizing such composition
Assignee: Mitsuboshi Belting Ltd
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Filing: 1987-08-12
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Granted: 1989-05-23
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Expires: 2007-08-12
Abstract
Abstract A thermally self-regulating elastomeric composition and heating element made therefrom. The composition includes a body of elastomeric material in which is distributed electrically conductive particulate material, such as carbon black. Short fibers are also distributed in the elastomeric matrix. In the disclosed invention, the short fibers are present in the amount of approximately 0.5 to 20 volume percent. In one alternate form, the matrix is foamed. Different arrangements of the electrodes in electrical conductive association with the thermally self-regulating elastomeric body are disclosed. Preferred proportions and characteristics of the particulate conductive material and short fibers providing optimum thermally self-regulating characteristics of the composition are disclosed.
Inventors
- 👤 Satoshi Mashimo
- 👤 Susumu Nagayasu
- 👤 Yoshio Yamaguchi
- 👤 Toru Noguchi
- 👤 Toshimichi Takada
- 👤 Hajime Kakiuchi
- 👤 Takahiro Yonezaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:25
CPC Classifications
C; C08; C08L; C08L19/00; H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/146; C08L21/00
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
38 words
A thermally self-regulating elastomeric composition comprising: a body of elastomer; electrically conductive particulate matter distributed in said elastomer; and short fibers distributed in said elastomer in an amount in the range of approximately 0.5 to 20 volume percent.
Claim 2
Dependent Claim
38 words
A thermally self-regulating elastomeric composition comprising: a body of elastomer; electrically conductive particulate matter distributed in said elastomer; and short fibers distributed in said elastomer in an amount in the range of approximately 0.5 to 20 volume percent.
Claim 3
Dependent Claim
63 words
A thermally self-regulating electrically energizable heating element comprising: a body of elastomer defining spaced surface portions; electrically conductive particulate matter distributed in said elastomer; short fibers distributed in said elastomer in an amount in the range of approximately 0.5 to 20 volume percent; and electrodes in electrically conductive association with said body at said surfaces for conducting electrical current through said body therebetween.
Claim 4
Dependent Claim
63 words
A thermally self-regulating electrically energizable heating element comprising: a body of elastomer defining spaced surface portions; electrically conductive particulate matter distributed in said elastomer; short fibers distributed in said elastomer in an amount in the range of approximately 0.5 to 20 volume percent; and electrodes in electrically conductive association with said body at said surfaces for conducting electrical current through said body therebetween.
Claim 5
Dependent Claim
17 words
The elastomeric composite of claim 1 or heating element of claim 2 wherein said elastomer comprises rubber.
Claim 6
Dependent Claim
20 words
The elastomeric composite of claim 1 or heating element of claim 2 wherein said conductive particulate matter comprises carbon black.
Claim 7
Dependent Claim
43 words
The elastomeric composite of claim 1 or heating element of claim 2 wherein said conductive particulate matter comprises carbon black present in an amount in the range of approximately 10 to 80 parts by weight to 100 parts by weight of the rubber.
Claim 8
Dependent Claim
38 words
The elastomeric composite of claim 1 or heating element of claim 2 wherein said conductive particulate matter comprises carbon black present in an amount in the range of approximately 30 to 60 parts by weight of the rubber.
Claim 9
Dependent Claim
33 words
The elastomeric composite of claim 1 or heating element of claim 2 wherein said conductive particulate matter comprises carbon black having approximately 20 to 70 mg. of specific surface area iodine absorption amount.
Claim 10
Dependent Claim
30 words
The elastomeric composite of claim 1 or heating element of claim 2 wherein said conductive particulate matter comprises carbon black having at least approximately 100 DBP oil absorption ml./100 g.
Claim 11
Dependent Claim
27 words
The elastomeric composite of claim 1 or heating element of claim 2 wherein said fibers have an aspect ratio in the range of approximately 100 to 3500.
Claim 12
Dependent Claim
24 words
The elastomeric composite of claim 1 or heating element of claim 2 wherein said fibers have a diameter of at least approximately 0.05 microns.
Claim 13
Dependent Claim
24 words
The elastomeric composite of claim 1 or heating element of claim 2 wherein said fibers have a length of at least approximately 20 microns.
Claim 14
Dependent Claim
42 words
The elastomeric composite of claim 1 or heating element of claim 2 wherein said fibers are organic fibers selected from the groups consisting of polyethylene terephthalate, polybutylene terephthalate, polypropylene, polyethylene, and polyether ketone, fatty polyamide, aromatic polyamide, cotton, vinylon, rayon, and acryl.
Claim 15
Dependent Claim
21 words
The elastomeric composite of claim 1 or heating element of claim 2 wherein said elastomeric body comprises a foamed elastomeric body.
Claim 16
Dependent Claim
30 words
The elastomeric composite of claim 1 or heating element of claim 2 wherein said fibers are present in an amount in the range of approximately 1 to 15 volume percent.
Claim 17
Dependent Claim
24 words
The elastomeric composite of claim 1 or heating element of claim 2 wherein said fibers are oriented in generally parallel relationship in said body.
Claim 18
Dependent Claim
33 words
The elastomeric composite of claim 1 or heating element of claim 2 wherein said fibers are formed of terephthalate resin selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate, and polypropylene terephalate.
Claim 19
Dependent Claim
12 words
The heating element of claim 2 wherein said electrodes comprises conductive fabric.
Claim 20
Dependent Claim
19 words
The heating element of claim 2 wherein said surface portions comprise spaced parallel apposite surface portions of the body.
Claim 21
Dependent Claim
18 words
The heating element of claim 2 wherein said surface portions comprise laterally spaced surface portions of the body.
Claim 22
Dependent Claim
19 words
The heating element of claim 2 wherein said spaced surface portions comprise coplanar flat surface portions of the body.
Claim 23
Dependent Claim
21 words
The heating element of claim 2 wherein said electrodes comprise conductive fabric embedded in said spaced surface portions of the body.
Claim 24
Dependent Claim
64 words
A thermally self-regulating electrically energizable heating element comprising: a body of foamed elastomer defining spaced surface portions; electrically conductive particulate matter distributed in said elastomer; short fibers distributed in said elastomer in an amount in the range of approximately 0.5 to 20 volume percent; and electrodes in electrically conductive association with said body at said surfaces for conducting electrical current through said body therebetween.
Claim 25
Dependent Claim
64 words
A thermally self-regulating electrically energizable heating element comprising: a body of foamed elastomer defining spaced surface portions; electrically conductive particulate matter distributed in said elastomer; short fibers distributed in said elastomer in an amount in the range of approximately 0.5 to 20 volume percent; and electrodes in electrically conductive association with said body at said surfaces for conducting electrical current through said body therebetween.
Claim 26
Dependent Claim
42 words
The heating element of claim 22 wherein the elastomer comprises an elastomer foamed by inclusion therein of foaming agent present in an amount in the range of approximately 2 to 30 parts by weight to 100 parts by weight of the elastomer.
Claim 27
Dependent Claim
13 words
The heating element of claim 22 wherein said foamed elastomer comprises foamed rubber.
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) | 1992-05-22 | 1992-11-21 | 1993-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-22 | 1996-11-21 | 1997-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-22 | 2000-11-21 | 2001-05-23 | $7700.00 | Window Closed / Lapsed |