US4521450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of increasing the electrical conductivity of cellulose-based materials or other impregnable materials
Assignee: MILLIKEN RESEARCH Corp SPARTANBURG SC A CORP OF
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Filing: 1983-06-20
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Granted: 1985-06-04
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Expires: 2003-06-20
Abstract
Abstract The electrical conductivity of solid, impregnable materials, such as cellulose-based insulating materials, can be increased by supplying to the solid impregnable material a substance with the ability, during polymerization of a pyrrole compound comprising at least one of the substances pyrrole and N-methylpyrrole, to give a polymer with higher electrical conductivity than the solid impregnable material, as well as a pyrrole compound of the kind stated, whereafter the pyrrole compound is transformed into a polymer in the solid, impregnable material.
Inventors
- 👤 Robert Bjorklund
- 👤 Hans Gustavsson
- 👤 Ingemar Lundstrom
- 👤 Bertil Nygren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:42
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/06; H01B1/12; H01B1/124; H01B1/128; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
119 words
A method of increasing the electrical conductivity of a solid, impregnable material which comprises the steps of (1) providing a chemical compound containing a metal ion which is capable of changing its valence in said solid, impregnable material, said chemical compound being capable, during the polymerization of a pyrrole compound selected from the group consisting of pyrrole and N-methylpyrrole and mixtures thereof, of providing the produced polymer with a higher electrical conductivity than that of said solid, impregnable material, (2) adding a pyrrole compound selected from the group consisting of pyrrole and N-methylpyrrole mixtures thereof to said solid, impregnable material from step (1), and (3) allowing said pyrrole compound in the solid, impregnable material from step (2) to polymerize.
Claim 2
Independent Claim
119 words
A method of increasing the electrical conductivity of a solid, impregnable material which comprises the steps of (1) providing a chemical compound containing a metal ion which is capable of changing its valence in said solid, impregnable material, said chemical compound being capable, during the polymerization of a pyrrole compound selected from the group consisting of pyrrole and N-methylpyrrole and mixtures thereof, of providing the produced polymer with a higher electrical conductivity than that of said solid, impregnable material, (2) adding a pyrrole compound selected from the group consisting of pyrrole and N-methylpyrrole mixtures thereof to said solid, impregnable material from step (1), and (3) allowing said pyrrole compound in the solid, impregnable material from step (2) to polymerize.
Claim 3
Dependent Claim
16 words
The method as defined in claim 1 wherein said chemical compound consists of a ferric compound.
Claim 4
Dependent Claim
24 words
The method as defined in claim 1 wherein in step (1) said solid, impregnable material is impregnated with a solution containing said chemical compound.
Claim 5
Dependent Claim
14 words
The method as defined in claim 3 wherein said solution is an aqueous solution.
Claim 6
Dependent Claim
14 words
The method as defined in claim 4 wherein said aqueous solution includes an acid.
Claim 7
Dependent Claim
25 words
The method as defined in claim 1 wherein in step (2) said solid, impregnable material is treated with the pyrrole compound in a liquid state.
Claim 8
Dependent Claim
25 words
The method as defined in claim 1 wherein in step (2) said solid, impregnable material is treated with the pyrrole compound in a gaseous state.
Claim 9
Dependent Claim
17 words
The method as defined in claim 1 wherein said solid, impregnable material comprises a cellulose-based insulating material.
Claim 10
Dependent Claim
14 words
The method as defined in claim 8 wherein said cellulose-based insulating material is paper.
Claim 11
Dependent Claim
14 words
The method as defined in claim 8 wherein said cellulose-based insulating material is pressboard.
References Cited (Backward Citations)
US3909195A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |