Patent US3972445A successfully refreshed from Google Patents.
US3972445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Easy-opening container ends
Assignee: The Broken Hill Proprietary Company Pty Ltd
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Filing: 1975-04-07
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Granted: 1976-08-03
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Expires: 1995-04-07
Abstract
Abstract This specification discloses a can end having push-in closures, one closures being smaller than the other for venting and/or pressure releasing purposes. At least the smaller closure having a supplementary sealant connection about which the closure hinges when it is opened. The supplementary sealant connection acts to prevent the closure becoming detached from the can end in the event that the main hinge for the closure is broken. The supplementary connection is achieved either by extending the sealant to cover an adjacent surface of the closure in a direction away from the connection or by increasing the thickness of the sealant covered in the area of the main hinge.
Inventors
- 👤 Michael Debenham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:57
CPC Classifications
B; B65; B65D; B65D17/00; B65D17/28; B65D17/401; B65D2205/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
218 words
An easy opening push-in metal can end including at least one opening and closure therefor, said closure being severed from the can end except in a hinge area wherein said closure is connected to the remainder of said can end by a hinge connection of unsevered metal about which the closure hinges when it is pushed into the can to open same, the edge of the closure and the edge of the can end surrounding the opening in contact or in close proximity so as to form a juncture when the closure is in the closed position, a sealant applied around the juncture of said closure and the edge of the can end surrounding said opening, and a supplementary connection of sealant comprising a section of sealant in the region of said hinge connection, said section of increased strength relative to the remainder of said sealant, said section being wider than the remainder of said sealant by extending over the adjacent surface of said closure in a direction away from said hinge connection, said section of sealant being sufficiently flexible to permit hinging of said closure when it is opened and being of sufficient increased strength to substantially reduce the likelihood of detachment of said closure from said end in the event that said hinge connection is broken.
Claim 2
Dependent Claim
218 words
An easy opening push-in metal can end including at least one opening and closure therefor, said closure being severed from the can end except in a hinge area wherein said closure is connected to the remainder of said can end by a hinge connection of unsevered metal about which the closure hinges when it is pushed into the can to open same, the edge of the closure and the edge of the can end surrounding the opening in contact or in close proximity so as to form a juncture when the closure is in the closed position, a sealant applied around the juncture of said closure and the edge of the can end surrounding said opening, and a supplementary connection of sealant comprising a section of sealant in the region of said hinge connection, said section of increased strength relative to the remainder of said sealant, said section being wider than the remainder of said sealant by extending over the adjacent surface of said closure in a direction away from said hinge connection, said section of sealant being sufficiently flexible to permit hinging of said closure when it is opened and being of sufficient increased strength to substantially reduce the likelihood of detachment of said closure from said end in the event that said hinge connection is broken.
Claim 3
Dependent Claim
26 words
Can end of claim 1, wherein the closure hinges about an axis upon opening, and said section extends in a direction generally perpendicular to said axis.
Claim 4
Dependent Claim
36 words
Can end of claim 1, wherein said can end includes at least two openings and closures therefor, one closure being a smaller venting/pressure releasing closure, at least said smaller closure having said supplementary connection of sealant.
Claim 5
Dependent Claim
12 words
Can end of claim 3, wherein said sealant is a pvc plastisol.
Claim 6
Dependent Claim
12 words
Can end of claim 1, wherein said sealant is of pvc plastisol.
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) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |