US3759439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bag with tear strip
Assignee: Imperial Chemical Industries Ltd
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Filing: 1971-04-09
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Granted: 1973-09-18
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Expires: 1991-04-09
Abstract
Abstract Plastic film having extending wholly or partly across it a flexible reinforcement having a highly localised line of weakness, the reinforcement being bonded to the surface of the film or incorporated partly or wholly within its thickness. The reinforcement may be, for example, a woven textile web material or plastic sheet. The resulting film may be used to make containers which can be easily opened by tearing along the line or lines of weakness in the reinforcement.
Inventors
- 👤 W Cross
- 👤 M Steel
- 👤 S Trueman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:15
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/006; C08B37/0063; C08B37/0075; B; B65; B65D; B65D75/00; B65D75/52; B65D75/58; B65D75/5816
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
144 words
A container comprising a tube of plastic film sealed at one end to provide a bag having two walls and a common sealed edge, a first flexible reinforcement strip attached to one wall and extending from a point in said common edge diagonally across a corner of said bag outwardly to a point beyond said bag, another similar flexible reinforcement strip attached to the other wall and extending from said point in said common edge diagonally across the same corner of said bag and outwardly beyond the bag so as to be in superimposed relationship with said first strip, the ends of said strips which extend beyond said bag being bonded together and said bonded ends being provided with a notch defining a line of localized weakness whereby tearing of said strips along said notch permits tearing of said container to open the same.
Claim 2
Dependent Claim
144 words
A container comprising a tube of plastic film sealed at one end to provide a bag having two walls and a common sealed edge, a first flexible reinforcement strip attached to one wall and extending from a point in said common edge diagonally across a corner of said bag outwardly to a point beyond said bag, another similar flexible reinforcement strip attached to the other wall and extending from said point in said common edge diagonally across the same corner of said bag and outwardly beyond the bag so as to be in superimposed relationship with said first strip, the ends of said strips which extend beyond said bag being bonded together and said bonded ends being provided with a notch defining a line of localized weakness whereby tearing of said strips along said notch permits tearing of said container to open the same.
Claim 3
Dependent Claim
18 words
A container according to claim 1 wherein the reinforcement strip comprises a woven textile web or plastic sheet.
Claim 4
Dependent Claim
21 words
A container according to claim 2 wherein the reinforcement strip comprises regenerated cellulose, polyamide, polyester, polyurethane, polyvinyl, acrylic or polyolefin polymer.
Claim 5
Dependent Claim
27 words
A container according to claim 2 wherein the reinforcement strip consists of two substantially parallel strips of reinforcing material disposed in abutting or closely spaced edge-to-edge relationship.
Claim 6
Dependent Claim
17 words
A container according to claim 2 wherein the reinforcement strip is from 0.01 - 2 mm. thick.
References Cited (Backward Citations)
US3088654A
Cited
US3146912A
Cited
FR1359938A
Cited
US3341108A
Cited
US3446632A
Cited
US3616990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |