US4332846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Can cover
Assignee: Millennium Petrochemicals Inc
•
Filing: 1981-03-31
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Granted: 1982-06-01
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Expires: 2001-03-31
Abstract
Abstract An improvement in can covers having a peelable closure member of the pull tab or tear strip type is provided wherein the closure member is fabricated from a partially hydrolyzed ethylene-vinyl acetate copolymer obtained from the hydrolysis of from about 50 percent to about 80 percent of the vinyl acetate groups of an ethylene-vinyl acetate copolymer containing from about 40 percent to about 80 percent by weight of interpolymerized vinyl acetate.
Inventors
- 👤 Joseph Fischer
- 👤 Gerald M. Platz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:01
CPC Classifications
B; B65; B65D; B65D17/00; B65D17/50; B65D17/501; B65D17/502; B65D2517/00; B65D2517/0001; B65D2517/001; B65D2517/0013; B65D2517/50; B65D2517/5002; B65D2517/5024; B65D2517/5032; B65D2517/5037; B65D2517/5072; B65D2517/5083; Y; Y10; Y10T; Y10T428/00; Y10T428/14; Y10T428/1438; Y10T428/1443; Y10T428/24; Y10T428/24273; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31855; Y10T428/31909; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
114 words
In an apertured aluminum can cover having a peelable closure member of the pull tab or tear strip type covering said aperture, such that when the aforesaid closure member is peeled away from the can cover to reveal the aperture, a portion of the closure member remains bonded to the can cover, the improvement which comprises a closure member directly adhered to the can cover, said closure member fabricated from a partially hydrolyzed ethylene-vinyl acetate copolymer obtained from the hydrolysis of from about 50 percent to about 80 percent of the vinyl acetate groups of an ethylene-vinyl acetate copolymer containing from about 40 percent to about 80 percent by weight of interpolymerized vinyl acetate.
Claim 2
Dependent Claim
114 words
In an apertured aluminum can cover having a peelable closure member of the pull tab or tear strip type covering said aperture, such that when the aforesaid closure member is peeled away from the can cover to reveal the aperture, a portion of the closure member remains bonded to the can cover, the improvement which comprises a closure member directly adhered to the can cover, said closure member fabricated from a partially hydrolyzed ethylene-vinyl acetate copolymer obtained from the hydrolysis of from about 50 percent to about 80 percent of the vinyl acetate groups of an ethylene-vinyl acetate copolymer containing from about 40 percent to about 80 percent by weight of interpolymerized vinyl acetate.
Claim 3
Dependent Claim
29 words
The can cover of claim 1 wherein the partially hydrolyzed ethylene-vinyl acetate copolymer constituting the closure member is backed with, and directly adhered to, a metal or plastic foil.
Claim 4
Dependent Claim
51 words
The can cover of claim 1 wherein the partially hydrolyzed ethylene-vinyl ester is obtained from the hydrolysis of from about 60 percent to about 75 percent of the vinyl acetate groups of an ethylene-vinyl acetate copolymer containing from about 50 percent to about 70 percent by weight of interpolymerized vinyl acetate.
Claim 5
Dependent Claim
37 words
The can cover of claim 1 wherein the strength of the bond between the can cover and the peelable closure member is at least about 15 pounds per linear inch of width of the peelable closure member.
Claim 6
Dependent Claim
37 words
The can cover of claim 4 wherein the strength of the bond between the can cover and the peelable closure member is at least about 20 pounds per linear inch of width of the peelable closure member.
References Cited (Backward Citations)
US2776787A
Cited
US3292828A
Cited
US3883034A
Cited
US3889844A
Cited
US3966079A
Cited
US3908857A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-31 | 1985-11-30 | 1986-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-31 | 1989-11-30 | 1990-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-31 | 1993-11-30 | 1994-06-01 | $7700.00 | Window Closed / Lapsed |