US4748070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film/fiber laminates
Assignee: Hercules LLC
•
Filing: 1986-03-24
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Granted: 1988-05-31
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Expires: 2006-03-24
Abstract
Abstract Tear strength of biaxially oriented polypropylene film is increased by laminating thereto a fibrous web of polypropylene fiber under conditions whereby the orientation of the film is retained.
Inventors
- 👤 David C. Beehler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:17
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; B32B27/32; B32B5/00; B32B5/02; B32B5/022; B32B2262/00; B32B2262/02; B32B2262/0253; B32B2305/00; B32B2305/38; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2307/582; B32B2307/5825; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/7246; B32B2323/00; B32B2323/10; B32B2439/00; B32B2439/70; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24826; Y10T428/27; 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
70 words
A high tear strength film comprised of a base film of biaxially oriented polypropylene having on one of its surfaces a layer of a lower melting polymer and, thermally bonded to said lower melting polymer layer, and coextensive with the biaxially oriented film, a fibrous polypropylene web, said web being bonded to the lower melting polymer layer in about 10 to 50% of the total surface area of the web.
Claim 2
Dependent Claim
70 words
A high tear strength film comprised of a base film of biaxially oriented polypropylene having on one of its surfaces a layer of a lower melting polymer and, thermally bonded to said lower melting polymer layer, and coextensive with the biaxially oriented film, a fibrous polypropylene web, said web being bonded to the lower melting polymer layer in about 10 to 50% of the total surface area of the web.
Claim 3
Dependent Claim
24 words
The high tear strength film of claim 1 wherein the fibrous web has a weight of about 10 to 40 grams per square yard.
Claim 4
Dependent Claim
17 words
The high tear strength film of claim 2 wherein the fibrous web is a nonwoven polypropylene fabric.
Claim 5
Dependent Claim
19 words
The high tear strength film of claim 2 wherein the fibrous web is a polypropylene bonded staple fiber scrim.
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) | 1991-05-31 | 1991-11-30 | 1992-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-31 | 1995-11-30 | 1996-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-31 | 1999-11-30 | 2000-05-31 | $7700.00 | Window Closed / Lapsed |