US3964415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Can closure
Assignee: 3M Co
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Filing: 1975-01-14
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Granted: 1976-06-22
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Expires: 1995-01-14
Abstract
Abstract Cans sealed with removable pressure-sensitive adhesive tape tabs over a pour hole successfully contain carbonated beverages or other pressure-generating liquids if the area around the pour hole and under the tape is slightly elevated, thereby putting the tape in shear rather in peel. Circular can ends may be provided with a circular pour hole, taped and then shaped to impart a frusto-conical area around the pour hole before being crimped over the tubular can body.
Inventors
- 👤 Harris W. Viker
- 👤 William E. Kropp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:35
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/38; B21D51/383; B65; B65D; B65D17/00; B65D17/50; B65D17/506; B65D53/00; B65D53/08; B65D2517/00; B65D2517/0001; B65D2517/001; B65D2517/0013; B65D2517/0058; B65D2517/0068; B65D2517/007; B65D2517/0091; B65D2517/0094; B65D2517/50; B65D2517/5072; B65D2517/5083
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
231 words
A method of making an end piece for use in fabricating a sealed pressurized container, comprising the steps of obtaining a pre-formed circular end piece of the type used in fabricating metal cans, said end piece having a depressed center portion with a pour hole therein and a circumferential lip for clamping over and sealing to one end of an annular can body, applying a strip of normally tacky and pressure-sensitive tape to the depressed center portion so as to overlie the pour hole and be sealed to the circumjacent surface, supporting the taped side of the end piece with a support means in an area adjacent to but spaced slightly radially outward from the pour hole, firmly gripping the end piece in said area, and providing a blunt punch with a tapered head which has a varying cross-sectional diameter in planes taken at right angles to its axis, the distal end of the punch head having a cross-sectional diameter smaller than the corresponding diameter of the pour hole and the main body of the punch head having a corresponding diameter larger than that of the pour hole, and forcing the punch head into the pour hole, thereby imparting an outwardly tapered configuration to the taped side of the end piece in the area circumjacent the pour hole, simultaneously stretching the tape and leaving it firmly adhered to the end piece.
Claim 2
Independent Claim
231 words
A method of making an end piece for use in fabricating a sealed pressurized container, comprising the steps of obtaining a pre-formed circular end piece of the type used in fabricating metal cans, said end piece having a depressed center portion with a pour hole therein and a circumferential lip for clamping over and sealing to one end of an annular can body, applying a strip of normally tacky and pressure-sensitive tape to the depressed center portion so as to overlie the pour hole and be sealed to the circumjacent surface, supporting the taped side of the end piece with a support means in an area adjacent to but spaced slightly radially outward from the pour hole, firmly gripping the end piece in said area, and providing a blunt punch with a tapered head which has a varying cross-sectional diameter in planes taken at right angles to its axis, the distal end of the punch head having a cross-sectional diameter smaller than the corresponding diameter of the pour hole and the main body of the punch head having a corresponding diameter larger than that of the pour hole, and forcing the punch head into the pour hole, thereby imparting an outwardly tapered configuration to the taped side of the end piece in the area circumjacent the pour hole, simultaneously stretching the tape and leaving it firmly adhered to the end piece.
Claim 3
Dependent Claim
36 words
The method of claim 1 wherein the pour hole is circular, the support means is a metal plate having a hole slightly larger than the pour hole and the punch head is a uniformly beveled cylinder.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein the support means is a yielding, resilient support.
References Cited (Backward Citations)
US564492A
Cited
US3281024A
Cited
US3251515A
Cited
US3292828A
Cited
US3331422A
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US3397811A
Cited
US3547305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |