US4256807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic latex modified pulp insulated conductors
Assignee: Nordx CDT Inc
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Filing: 1979-08-23
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Granted: 1981-03-17
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Expires: 1999-08-23
Abstract
Abstract A pulp insulated electric communications conductor in which the wood pulp fibers of the insulation are coated with an aqueous based cationic deposition aid polymer and then an aqueous based anionic latex polymer. In a process for applying a layer of insulating material to the conductor a slurry of wood pulp fibers is prepared to which first an aqueous based cationic deposition aid polymer is added and then an aqueous based anionic latex polymer is added, the resultant coated wood pulp fibers being applied to the conductor.
Inventors
- 👤 John A. Jukes
- 👤 Thomas C. Pound
- 👤 Wayne A. Cascarano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:37
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/48; H01B13/00; H01B13/06; H01B13/12; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
65 words
An electric wire conductor having an insulation of expanded wood pulp, the fibers of the wood pulp surrounded by an inner coating of an aqueous based cationic deposition aid polymer and an outer coating of an aqueous based anionic latex polymer, both layers being devoid of a polyvalent metal salt, to produce a dielectric constant comparable to a conventional non-coated pulp insulation of greater thickness.
Claim 2
Dependent Claim
65 words
An electric wire conductor having an insulation of expanded wood pulp, the fibers of the wood pulp surrounded by an inner coating of an aqueous based cationic deposition aid polymer and an outer coating of an aqueous based anionic latex polymer, both layers being devoid of a polyvalent metal salt, to produce a dielectric constant comparable to a conventional non-coated pulp insulation of greater thickness.
Claim 3
Dependent Claim
15 words
A conductor according to claim 1, wherein the latex polymer is an anionic acrylic latex.
Claim 4
Dependent Claim
16 words
A conductor according to claim 1, wherein the latex polymer is an anionic styrene butadiene latex.
Claim 5
Dependent Claim
35 words
A conductor according to claim 1, wherein the latex polymer is between 1% and 50% by weight of the fibers and the deposition aid polymer is between 0.3% and 1.0% by weight of the fibers.
Claim 6
Dependent Claim
31 words
A conductor according to claim 1, wherein the latex polymer is approximately 15% by weight of the fibers and the deposition aid polymer is approximately 0.4% by weight of the fibers.
Claim 7
Dependent Claim
17 words
A conductor according to claim 1, wherein the deposition aid polymer is a quaternary amino acrylic ester.
Claim 8
Dependent Claim
13 words
A conductor according to claim 1, wherein the deposition aid polymer is polyethylenimine.
Claim 9
Dependent Claim
80 words
An electric wire conductor having an insulation of expanded wood pulp, the fibers of the wood pulp surrounded by an inner coating of an aqueous based cationic deposition aid polymer which is a quaternary amino acrylic ester polymer and an outer coating of an aqueous based anionic latex polymer which is an acrylic latex polymer, and both layers being devoid of a polyvalent metal salt to produce a dielectric constant comparable to a conventional non-coated pulp insulation of greater thickness.
Claim 10
Dependent Claim
80 words
An electric wire conductor having an insulation of expanded wood pulp, the fibers of the wood pulp surrounded by an inner coating of an aqueous based cationic deposition aid polymer which is a quaternary amino acrylic ester polymer and an outer coating of an aqueous based anionic latex polymer which is an acrylic latex polymer, and both layers being devoid of a polyvalent metal salt to produce a dielectric constant comparable to a conventional non-coated pulp insulation of greater thickness.
Claim 11
Dependent Claim
76 words
An electric wire conductor having an insulation of expanded wood pulp, the fibers of the wood pulp surrounded by an inner coating of an aqueous based cationic deposition aid polymer which is polyethylenimine and an outer coating of an aqueous based anionic latex polymer which is a styrene butadiene latex polymer, and both layers being devoid of a polyvalent metal salt to produce a dielectric constant comparable to a conventional non-coated pulp insulation of greater thickness.
Claim 12
Dependent Claim
76 words
An electric wire conductor having an insulation of expanded wood pulp, the fibers of the wood pulp surrounded by an inner coating of an aqueous based cationic deposition aid polymer which is polyethylenimine and an outer coating of an aqueous based anionic latex polymer which is a styrene butadiene latex polymer, and both layers being devoid of a polyvalent metal salt to produce a dielectric constant comparable to a conventional non-coated pulp insulation of greater thickness.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |