Patent US4303733A successfully refreshed from Google Patents.
US4303733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filament with conductive layers
Assignee: Akzona Inc
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Filing: 1980-01-21
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Granted: 1981-12-01
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Expires: 2000-01-21
Abstract
Abstract A filament of synthetic polymers which, in its cross section over the entire length of the thread, comprises at least three layers, of which at least two layers are electrically conductive and at least one layer located between the conductive layers consists of an electrically insulating synthetic polymer.
Inventors
- 👤 Wolfgang Bulle
- 👤 Hans G. Tilgner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:39
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/24; D01F; D01F8/00; H; H04; H04R; H04R17/00; H04R17/005; H10; H10N; H10N30/00; H10N30/60; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/2933; Y10T428/2935; Y10T428/294; Y10T428/2942; Y10T428/2944; Y10T428/2958; Y10T428/2964; Y10T428/2967; Y10T428/2969; Y10T428/2973; Y10T428/2975
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
61 words
A filament from synthetic polymers adapted for use in an electrical circuit, having a cross section comprising at least three layers, at least two of which are electrically conductive, and wherein at least one of said layers is located between said conductive layers and comprises an electrically insulating, synthetic polymer, and wherein the electrically conductive layers are provided with electrical connections.
Claim 2
Dependent Claim
61 words
A filament from synthetic polymers adapted for use in an electrical circuit, having a cross section comprising at least three layers, at least two of which are electrically conductive, and wherein at least one of said layers is located between said conductive layers and comprises an electrically insulating, synthetic polymer, and wherein the electrically conductive layers are provided with electrical connections.
Claim 3
Dependent Claim
62 words
A filament from synthetic polymers, having a cross section comprising at least three layers, at least two of which are electrically conductive, and wherein at least one of said layers is located between said conductive layers and comprises an electrically insulating, synthetic polymer, one of said electrically conductive layers surrounds said other layers and extends over the entire circumference of said filament.
Claim 4
Dependent Claim
62 words
A filament from synthetic polymers, having a cross section comprising at least three layers, at least two of which are electrically conductive, and wherein at least one of said layers is located between said conductive layers and comprises an electrically insulating, synthetic polymer, one of said electrically conductive layers surrounds said other layers and extends over the entire circumference of said filament.
Claim 5
Dependent Claim
29 words
The filament of claim 1 or 2, wherein said filament is a multi-component filament of the core-skin type, with an electrically conductive core component and an electrically conductive surface.
Claim 6
Dependent Claim
11 words
The filament of claim 3, wherein said core component is compressible.
Claim 7
Dependent Claim
26 words
The filament of claim 3, wherein said core component is an electrically conductive, highly viscous liquid having metal and/or carbon black and/or graphite particles dispersed therein.
Claim 8
Dependent Claim
26 words
The filament of claims 1 or 2, wherein said filament is a hollow filament, made up of at least three layers in the filament cross section.
Claim 9
Dependent Claim
18 words
The filament of claims 1 or 2, wherein said electrically insulating, synthetic polymer is at least partially crystallizable.
Claim 10
Dependent Claim
14 words
The filament of claim 7, wherein said electrically insulating, synthetic polymer is molecularly oriented.
Claim 11
Dependent Claim
13 words
The filament of claims 1 or 2, wherein said filament displays piezoelectric characteristics.
Claim 12
Dependent Claim
34 words
The filament of claim 6, having a diameter of from 50 to 1000 microns, a hollow space with a cross-sectional radius of from 30-800 microns, and wall thickness of from 10 to 100 microns.
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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) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |