Patent US3945495A successfully refreshed from Google Patents.
US3945495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Household plastic film in roll form and embodying a curled leading edge
Assignee: DowBrands Inc
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Filing: 1974-12-05
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Granted: 1976-03-23
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Expires: 1994-12-05
Abstract
Abstract Rolls of household or consumer type films or wrapping materials are provided with a curled leading edge that is ideally suited as a grasping tab for starting initial withdrawal of the film such as from a standard consumer type dispensing carton. The invention is applied to films exhibiting relatively high residual shrinkage or stress relaxation and is practiced by applying a coating to, or alternately solvent treating, the leading edge, in a manner that unbalances the rate of shrinkage at the opposite surfaces of the edge, thereby inducing a curling effect. Further attributes of such a starting feature would include easy identification of the leading edge, and the lessening of sensitivity to tear propagation such as from a notch or a like tear propagating flaw as may be left in the leading edge by the film cutter bar.
Inventors
- 👤 William D. Carmody
- 👤 William Robb Roy Park
- 👤 Gordon E. Gould
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:27
CPC Classifications
B; B65; B65H; B65H18/00; B65H18/28; B65D; B65D65/00; B65D65/02; B65D65/22; B65D65/38; B65D65/42; B65D75/00; Y; Y10; Y10S; Y10S428/00; Y10S428/906; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
77 words
A roll of consumer type plastic wrapping film wound on a core, the film being characterized as a film having inherent residual shrinkage due to orientation imparted to the film in the longitudinal direction during the manufacture thereof, the improvement which comprises, a coating adhered to one surface of the leading edge of the roll to induce curling of said edge, to thereby promote easy identification and grasping of same to initiate the use of the roll.
Claim 2
Dependent Claim
77 words
A roll of consumer type plastic wrapping film wound on a core, the film being characterized as a film having inherent residual shrinkage due to orientation imparted to the film in the longitudinal direction during the manufacture thereof, the improvement which comprises, a coating adhered to one surface of the leading edge of the roll to induce curling of said edge, to thereby promote easy identification and grasping of same to initiate the use of the roll.
Claim 3
Dependent Claim
17 words
The combination of claim 1 wherein said roll is contained within a carton for dispensing the film.
Claim 4
Dependent Claim
15 words
The combination of claim 2 wherein said curl is at least about one full turn.
Claim 5
Dependent Claim
11 words
The combination of claim 3 wherein said coating comprises carnauba wax.
Claim 6
Dependent Claim
13 words
The combination of claim 1 wherein said film comprises a vinylidene chloride copolymer.
Claim 7
Dependent Claim
37 words
A roll of film contained within a dispensing carton and wherein the leading edge of the roll is curled by selectively induced shrinkage thereof to promote easy identification and grasping thereof to initiate dispensing of the roll.
Claim 8
Dependent Claim
37 words
A roll of film contained within a dispensing carton and wherein the leading edge of the roll is curled by selectively induced shrinkage thereof to promote easy identification and grasping thereof to initiate dispensing of the roll.
Claim 9
Dependent Claim
14 words
The combination of claim 6 wherein said curl has been induced by solvent treatment.
Claim 10
Dependent Claim
22 words
The combination of claim 6 wherein said curl has been induced by adhering a coating to one surface of said leading edge.
Claim 11
Dependent Claim
13 words
The combination of claim 6 wherein said film comprises a vinylidene chloride copolymer.
Claim 12
Dependent Claim
18 words
The combination of claim 9 wherein said curl comprises at least about three-quarters of a turn or greater.
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) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |