US4168251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic-wood powder mixture for making insulating material for the electrical industry
Assignee: Rehau Automotive SE and Co KG
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Filing: 1978-02-13
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Granted: 1979-09-18
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Expires: 1998-02-13
Abstract
Abstract A method of forming an electrically insulating material having good mechanical properties by mixing a polyvinyl chloride polymer with a natural cellulose material in an amount of from 25 to 30% by weight to form a substantially homogeneous mixture consisting essentially of the polyvinyl chloride and natural cellulose material.
Inventors
- 👤 Hartmut Schinzel
- 👤 Ernst Wunderlich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:43
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/48; H01B3/52; C; C08; C08L; C08L101/00; C08L27/00; C08L27/02; C08L27/04; C08L27/06; H01B3/002; H01B3/006; H01B3/30; H01B3/44; H01B3/443; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
57 words
A composition suitable for making an electrical insulator consisting essentially of substantially homogeneous mixture of a polymer containing at least 80% polyvinyl chloride, with a natural cellulose material; said natural cellulose material being from 25 to 30 percent by weight of the polyvinyl chloride and natural cellulose material, and having a particle size of less than 500μ.
Claim 2
Dependent Claim
57 words
A composition suitable for making an electrical insulator consisting essentially of substantially homogeneous mixture of a polymer containing at least 80% polyvinyl chloride, with a natural cellulose material; said natural cellulose material being from 25 to 30 percent by weight of the polyvinyl chloride and natural cellulose material, and having a particle size of less than 500μ.
Claim 3
Dependent Claim
13 words
The composition of claim 1 wherein the natural cellulose material is wood meal.
Claim 4
Dependent Claim
19 words
The composition of claim 1 wherein the moisture content of the natural cellulose material is less than 0.1 percent.
Claim 5
Dependent Claim
26 words
The composition of claim 2 wherein the cellulose material is wood meal, said wood meal being present in about 25 percent by weight of the mixture.
Claim 6
Dependent Claim
27 words
The composition of claim 2 wherein the cellulose material is wood meal, said wood meal being present in 25 to 30 percent by weight of the mixture.
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) | 1982-09-17 | 1983-03-19 | 1983-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-17 | 1987-03-19 | 1987-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-17 | 1991-03-19 | 1991-09-18 | $7700.00 | Window Closed / Lapsed |