Patent US5296307A successfully refreshed from Google Patents.
US5296307A
Expired / Lapsed
US
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Laminated paper polyolefin paper composite
Assignee: Electric Power Research Institute
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Filing: 1992-05-08
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Granted: 1994-03-22
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Expires: 2012-05-08
Abstract
Abstract The use of inorganic additives such as mica in the polyolefin layer of paper polyolefin paper laminates improves the electrical characteristics, gives resistance to discharge, and facilitates reduction of swelling in contact with oil. Accordingly, the present invention provides laminated paper polyolefin paper composites comprising first and second fiber paper layers, and a polyolefin layer comprising an inorganic additive such as mica.
Inventors
- 👤 Bruce S. Bernstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:53
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/10; B32B27/18; B32B27/20; B32B27/32; B32B2323/00; B32B2323/10; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1023; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24612; Y10T428/25; Y10T428/251; Y10T428/29; Y10T428/2913; Y10T428/2927; Y10T428/31504; Y10T428/31855; Y10T428/31931; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
27 words
A laminated paper polyolefin composite comprising first and second fiber paper layers each laminated to a polyolefin layer containing silicates which impart discharge resistance to said composite.
Claim 2
Dependent Claim
27 words
A laminated paper polyolefin composite comprising first and second fiber paper layers each laminated to a polyolefin layer containing silicates which impart discharge resistance to said composite.
Claim 3
Dependent Claim
11 words
A composite as in claim 1 wherein said polyolefin comprises polypropylene.
Claim 4
Dependent Claim
11 words
A composite as in claim 1 wherein said polyolefin comprises polymethylpentene.
Claim 5
Dependent Claim
11 words
A composite as in claim 1 wherein said silicates comprise mica.
Claim 6
Dependent Claim
12 words
A composite as in claim 1 wherein said polyolefin layer comprises sheets.
Claim 7
Dependent Claim
17 words
A composite as in claim 1 wherein said polyolefin layer contains 0.05 to 5.0% of said silicates.
Claim 8
Dependent Claim
15 words
A composite as in claim 4 wherein said polyolefin layer contains 0.5 to 3.0% mica.
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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) | 1997-03-21 | 1997-09-20 | 1998-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-21 | 2001-09-20 | 2002-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-21 | 2005-09-20 | 2006-03-22 | $7700.00 | Window Closed / Lapsed |