US3756448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Easy opening structure
Assignee: Continental Can Co Inc
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Filing: 1971-02-17
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Granted: 1973-09-04
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Expires: 1991-02-17
Abstract
Abstract An easy opening container including a plastic closure having a pull tab releasably bonded to an end closure for sealing a pour opening. The pull tab includes a lateral flexible section extending across the tab. The flexible section provides a hinge line about which the tab swings to permit venting of gases within the container.
Inventors
- 👤 J Moller
- 👤 W Devane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:50
CPC Classifications
B; B65; B65D; B65D17/00; B65D17/50; B65D17/506
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
128 words
An easy-opening end unit for a container comprising an end unit having a pour opening, a plastic pull tab having a sealing web including marginal edge portion bordering said opening and releasably bonded to said end unit for sealing said opening, a downwardly extending flange contoured complementary to said pour opening for insertion therein, a finger grip portion extending from said web, said web overlying said opening and having a groove extending normal to the direction in which a force is applied to separate said web from said end, a pair of notches in said flange aligned with said groove, said groove and said notches providing a hinge line about which said pull tab is swingable during removal of said tab from bonding relation with said end unit.
Claim 2
Dependent Claim
128 words
An easy-opening end unit for a container comprising an end unit having a pour opening, a plastic pull tab having a sealing web including marginal edge portion bordering said opening and releasably bonded to said end unit for sealing said opening, a downwardly extending flange contoured complementary to said pour opening for insertion therein, a finger grip portion extending from said web, said web overlying said opening and having a groove extending normal to the direction in which a force is applied to separate said web from said end, a pair of notches in said flange aligned with said groove, said groove and said notches providing a hinge line about which said pull tab is swingable during removal of said tab from bonding relation with said end unit.
Claim 3
Dependent Claim
50 words
The invention as defined in claim 1 wherein the marginal edge portions releasably bonded to said end unit on the side of said hinge line remote from said finger grip portion is of greater cross-section area than said marginal edge portion on the same side of said finger grip portion.
Claim 4
Dependent Claim
27 words
The invention as defined in claim 1 wherein said flange is formed with a further notch adjacent the juncture of said finger grip portion and said web.
Claim 5
Dependent Claim
30 words
The invention as defined in claim 3 wherein said opening is substantially tear drop shaped, and wherein said further notch is located at the narrow end of said tear drop.
Claim 6
Dependent Claim
30 words
The invention as defined in claim 3 wherein said opening is bounded by a plastic rim and wherein said flange includes means releasably latching said pull tab to said rim.
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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |