US4587037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrrole polymers as electrical heating elements
Assignee: BASF SE
•
Filing: 1984-05-04
•
Granted: 1986-05-06
•
Expires: 2004-05-04
Abstract
Abstract Moldings from the class of the pyrrole polymers which are complexed with anions are used as electrical heating elements.
Inventors
- 👤 Helmut Munstedt
- 👤 Helmut Gebhard
- 👤 Herbert Naarmann
- 👤 Johannes Schlag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:49
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/146
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
48 words
A heating element which comprises: a molding of a pyrrole polymer which has been complexed with anions, said molding being shaped to the desired dimensions of the heating element; and means connected to the molding to pass an electrical current through said molding in a heat generating manner.
Claim 2
Dependent Claim
48 words
A heating element which comprises: a molding of a pyrrole polymer which has been complexed with anions, said molding being shaped to the desired dimensions of the heating element; and means connected to the molding to pass an electrical current through said molding in a heat generating manner.
Claim 3
Dependent Claim
17 words
A heating element as described in claim 1, wherein the pyrrole polymer is a homopolymer of pyrrole.
Claim 4
Dependent Claim
28 words
A heating element as described in claim 1, wherein the pyrrole polymer is a homopolymer of a 3,4-dialkylpyrrole, said alkyl containing 1 to 4 carbons, or a 3,4-dihalopyrrole.
Claim 5
Dependent Claim
33 words
A heating element as described in claim 1, wherein the pyrrole polymer is a copolymer of 10 parts pyrrole and from 1 to 10 parts of a monomer that is copolymerizable with pyrrole.
Claim 6
Dependent Claim
23 words
A heating element as described in claim 1, wherein said molding is coated with an organic compound having a low permeability to gases.
Claim 7
Dependent Claim
17 words
A heating element as described in claim 5, wherein said organic compound is a vinylidene chloride polymer.
Claim 8
Dependent Claim
16 words
A heating element as described in claim 5, wherein said organic compound is a vinylideneacrylate copolymer.
Claim 9
Dependent Claim
18 words
A heating element as described in claim 5, wherein said coating is from 10 to 150 μm thick.
Claim 10
Dependent Claim
17 words
A heating element as described in claim 1, wherein said molding is a flexible film or sheet.
Claim 11
Dependent Claim
17 words
A heating element as described in claim 5, wherein said molding is a flexible film or sheet.
References Cited (Backward Citations)
US3574072A
Cited
US4468291A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |