Patent US3607616A successfully refreshed from Google Patents.
US3607616A
Expired / Lapsed
US
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Laminated amorphous and crystalline polypropylene sheeting
Assignee: Eastman Kodak Co
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Filing: 1968-11-22
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Granted: 1971-09-21
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Expires: 1988-11-22
Abstract
Abstract A laminated polypropylene sheeting having physical properties comparable to those of crystalline polypropylene sheeting and comprising a core of polypropylene fiber batting impregnated with amorphous polypropylene laminated to at least one and preferably between two sheets of crystalline polypropylene is disclosed.
Inventors
- 👤 Herbert S Barbehenn
- 👤 Robert F Williams Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:54
CPC Classifications
B; B65; B65D; B65D75/00; B32; B32B; B32B27/00; B29; B29K; B29K2023/00; B29K2023/10; B29K2023/12; B29K2105/00; B29K2105/06; B29K2105/12; B29K2105/128; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/254; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T442/00; Y10T442/60; Y10T442/674; Y10T442/678
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
24 words
A solid article as in claim 1, wherein said second layer is a core layer sealed between cover layers of said largely crystalline polypropylene.
Claim 2
Dependent Claim
25 words
A solid article as in claim 2, wherein said article is a film and said fibers are distributed randomly and uniformly through said core layer.
Claim 3
Dependent Claim
34 words
A solid article as in claim 3, wherein the polypropylene in said fibers have a density of from about 0.90 to about 0.94 and a molecular weight of from about 50,000 to about 700,000.
Claim 4
Dependent Claim
51 words
A solid article as in claim 4, wherein the weight ratio in said core layer of said amorphous polypropylene to said fibers is between about 6:1 and about 8:1, and said largely crystalline polypropylene in said cover layer has a density of from about 0.9 to about 0.95 grams/per cubic centimeter.
Claim 5
Dependent Claim
27 words
A solid article as in claim 5, wherein said article is a three-layered laminate, and one of said cover layers is thicker than the second cover layer.
References Cited (Backward Citations)
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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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |