Patent US4543279A successfully refreshed from Google Patents.
US4543279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic film product
Assignee: Asahi Kasei Corp
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Filing: 1983-03-03
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Granted: 1985-09-24
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Expires: 2003-03-03
Abstract
Abstract A plastic film product, such as a sealed bag, wound film or adhesive tape, has a plurality of random scratches or cuts having notches toward the other side of the film, formed along the edges thereof so as to be shallow and small enough to be invisible to the naked eye in order to reduce resistance to tearing perpendicular to the edges.
Inventors
- 👤 Hisao Kai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:46
CPC Classifications
B; B24; B24B; B24B9/00; B65; B65D; B65D75/00; B65D75/52; B65D75/58; Y; Y10; Y10S; Y10S206/00; Y10S206/82; Y10S428/00; Y10S428/906; Y10T; Y10T428/00; Y10T428/15; Y10T428/24; Y10T428/24777
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
76 words
In a sealed bag formed of plastic film material including two sheets fused together along at least three fused edge surfaces thereof, the improvement wherein a plurality of minute scratches, sufficiently shallow and minute so as to be invisible to the naked eye, are densely formed only on said fused edge surfaces so as to reduce resistance to tearing through said fused edge surfaces perpendicularly thereto without reducing the toughness of interior portions of said sheets.
Claim 2
Dependent Claim
76 words
In a sealed bag formed of plastic film material including two sheets fused together along at least three fused edge surfaces thereof, the improvement wherein a plurality of minute scratches, sufficiently shallow and minute so as to be invisible to the naked eye, are densely formed only on said fused edge surfaces so as to reduce resistance to tearing through said fused edge surfaces perpendicularly thereto without reducing the toughness of interior portions of said sheets.
Claim 3
Dependent Claim
28 words
The improvement as in claim 1, wherein said plurality of scratches are formed along substantially the entire extent of each of said at least three fused edge surfaces.
Claim 4
Dependent Claim
31 words
The improvement as in claim 2, wherein said two sheets are integrally joined along a common edge having opposite ends intersecting separate ones of said at least three fused edge surfaces.
Claim 5
Dependent Claim
56 words
The improvement as in claim 1, wherein the density of said plurality of scratches along said at least three fused edges is at least five scratches per centimeter of length along each of said at least three fused edges, said plurality of scratches being nonuniformly and randomly spaced along said at least three fused edge surfaces.
Claim 6
Dependent Claim
41 words
The improvement as in claim 4, wherein the density of said plurality of scratches along said at least three fused edge surfaces is at least twenty scratches per centimeter of length along each of said at least three fused edge surfaces.
Claim 7
Dependent Claim
65 words
A wound tape formed of a plastic film material, said tape comprising a plurality of minute scratches, sufficiently shallow and minute so as to be invisible to the naked eye, densely formed only along the entire extents of both side edges thereof so as to reduce resistance to tearing perpendicularly to said side edges, said tape having adhesive formed on at least one side thereof.
Claim 8
Dependent Claim
65 words
A wound tape formed of a plastic film material, said tape comprising a plurality of minute scratches, sufficiently shallow and minute so as to be invisible to the naked eye, densely formed only along the entire extents of both side edges thereof so as to reduce resistance to tearing perpendicularly to said side edges, said tape having adhesive formed on at least one side thereof.
Claim 9
Dependent Claim
49 words
A wound tape as in claim 6, wherein the density of said plurality of scratches is at least five scratches per centimeter of length of each of said side edges, and said plurality of scratches are nonuniformly and randomly spaced along the length of each of said side edges.
Claim 10
Dependent Claim
30 words
A wound tape as in claim 7, wherein the density of said plurality of scratches is at least twenty scratches per centimeter of length of each of said side edges.
Claim 11
Dependent Claim
60 words
A plastic film product, comprising a laminate of plastic film and a metal film, said laminate having a plurality of edges, each of said plurality of edges having a plurality of minute, scratches, sufficiently minute and shallow so as to be invisible to the naked eye, densely formed therealong so as to reduce resistance to tearing perpendicularly to said edges.
Claim 12
Dependent Claim
60 words
A plastic film product, comprising a laminate of plastic film and a metal film, said laminate having a plurality of edges, each of said plurality of edges having a plurality of minute, scratches, sufficiently minute and shallow so as to be invisible to the naked eye, densely formed therealong so as to reduce resistance to tearing perpendicularly to said edges.
Claim 13
Dependent Claim
37 words
A plastic film product as in claim 9, wherein said laminate comprises a sealed dispensing bag and said plurality of edge surfaces comprise at least three edges sealed by fusion, having said plurality of scratches only therealong.
Claim 14
Dependent Claim
16 words
A plastic film product as in claim 9, wherein said laminate consists of a wound tape.
Claim 15
Dependent Claim
24 words
A plastic film product as in claim 11, wherein said wound tape comprises a layer of adhesive material on at least one side thereof.
Claim 16
Dependent Claim
55 words
A plastic product according to any one of claims 9, 10, 11 or 12, wherein the density of said plurality of scratches is at least five scratches per centimeter of length along each of said plurality of edges, and said plurality of scratches are nonuniformly and randomly spaced along each of said plurality of edges.
Claim 17
Dependent Claim
32 words
A plastic film product as in claim 13, wherein the density of said plurality of scratches is at least twenty scratches per centimeter of length along each of said plurality of edges.
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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) | 1988-09-23 | 1989-03-25 | 1989-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-23 | 1993-03-25 | 1993-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-23 | 1997-03-25 | 1997-09-24 | $7700.00 | Window Closed / Lapsed |