US3986633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tab for easy-opening container wall
Assignee: Alcoa Corp
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Filing: 1976-01-22
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Granted: 1976-10-19
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Expires: 1996-01-22
Abstract
Abstract A pull tab comprises a tab body, a tang and a portion connecting the tang to the tab body. In the pull tab, which is attachable to an easy-open end container wall, the tang projects from the tab body such that upon attaching the tang to the container wall, the tang holds the pull tab against a central portion of the container wall to prevent excessive lifting of the tab body therefrom when the central portion is outwardly domed as a result of pressure in the container.
Inventors
- 👤 Charles L. Jordan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:05
CPC Classifications
B; B65; B65D; B65D17/00; B65D17/28; B65D17/401; B65D17/4011
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
140 words
An improved pull tab of the type attachable to an easy-opening end wall on a container to initiate severance of a segment from said wall, said container of the type subjected to internal pressure, said pull tab comprising: a tab body formed from sheet material and having a finger receiving opening; a tang having a portion thereof adapted to be attached to said easy-opening end wall; and a connecting portion connecting said tang to said tab body at one side thereof, said tang projecting out of said tab body such that upon attaching said tang to said easy-opening end wall, said tang holds said tab body under spring pressure against said end wall to prevent excessive lifting of said tab body from said central portion when said central portion is domed as a result of internal pressure in the container.
Claim 2
Dependent Claim
140 words
An improved pull tab of the type attachable to an easy-opening end wall on a container to initiate severance of a segment from said wall, said container of the type subjected to internal pressure, said pull tab comprising: a tab body formed from sheet material and having a finger receiving opening; a tang having a portion thereof adapted to be attached to said easy-opening end wall; and a connecting portion connecting said tang to said tab body at one side thereof, said tang projecting out of said tab body such that upon attaching said tang to said easy-opening end wall, said tang holds said tab body under spring pressure against said end wall to prevent excessive lifting of said tab body from said central portion when said central portion is domed as a result of internal pressure in the container.
Claim 3
Dependent Claim
22 words
A tab according to claim 1 wherein said tang projects out of said tab body at an angle of at least 10°.
Claim 4
Dependent Claim
25 words
A tab according to claim 1 wherein said tang projects out of said tab body at an angle in the range of 10° to 50°.
Claim 5
Dependent Claim
166 words
An improved easy-opening closure for a container of the type wherein opening of the closure is initiated by severance of a score line by a pull tab secured to said end closure by means of a hollow rivet integrally formed with said end closure, wherein the improvement comprises a pull tab having: a tab body formed from sheet material and having a ring-like configuration; a tang having a portion thereof adapted to be attached to said easy-opening end wall; and a connecting portion connecting said tang to said tab body at one side thereof, said tab body having a lifting portion substantially opposite said tang, said tang formed to project out of said tab body such that upon attaching said tang to said easy-opening end wall, said tang holds said tab body under spring pressure against said end wall to prevent excessive lifting of said tab body from said central portion when said central portion is domed as a result of internal pressure in the container.
Claim 6
Dependent Claim
166 words
An improved easy-opening closure for a container of the type wherein opening of the closure is initiated by severance of a score line by a pull tab secured to said end closure by means of a hollow rivet integrally formed with said end closure, wherein the improvement comprises a pull tab having: a tab body formed from sheet material and having a ring-like configuration; a tang having a portion thereof adapted to be attached to said easy-opening end wall; and a connecting portion connecting said tang to said tab body at one side thereof, said tab body having a lifting portion substantially opposite said tang, said tang formed to project out of said tab body such that upon attaching said tang to said easy-opening end wall, said tang holds said tab body under spring pressure against said end wall to prevent excessive lifting of said tab body from said central portion when said central portion is domed as a result of internal pressure in the container.
Claim 7
Dependent Claim
26 words
The pull tab according to claim 4 wherein said tang projects out of said tab body at an angle in the range of 10° to 50°.
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) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |