Patent US3973693A successfully refreshed from Google Patents.
US3973693A
Expired / Lapsed
US
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Containers for containing carbonated beverages
Assignee: Plastona John Waddington Ltd
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Filing: 1975-03-05
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Granted: 1976-08-10
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Expires: 1995-03-05
Abstract
Abstract A thin-walled nestable plastic container of the type having a tapering cylindrical wall is provided with an expansible bottom employing a central conical portion projecting upwardly into the container. The central conical portion is arranged to invert under pressure so that the cone decreases in height as it turns inside out. The base of the cone remains circular as the cone inverts and thereby provides a stable base on which the container can rest. The cone is not intended to invert completely and consequently, the apex of the cone is preferably stiffened by thickening of the wall.
Inventors
- 👤 Jack Brocklehurst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:21
CPC Classifications
B; B65; B65D; B65D1/00; B65D1/22; B65D1/26; B65D1/265
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
107 words
In a thin-walled nestable plastic container of the type having a frustro-conical wall portion, the improvement of an expansible bottom comprising a conical portion extending centrally upward into the frustro-conical portion of the container, a radial shoulder ring section connected to the bottom of the conical section and extending radially outwardly therefrom, an axial ring section attached to the radial shoulder ring section at its outer periphery and extending downwardly therefrom, a radial base ring section attached to the lower end of the axial ring section and extending outwardly therefrom, and means connecting the radial base ring section to the lower end of the frustro-conical wall portion.
Claim 2
Dependent Claim
107 words
In a thin-walled nestable plastic container of the type having a frustro-conical wall portion, the improvement of an expansible bottom comprising a conical portion extending centrally upward into the frustro-conical portion of the container, a radial shoulder ring section connected to the bottom of the conical section and extending radially outwardly therefrom, an axial ring section attached to the radial shoulder ring section at its outer periphery and extending downwardly therefrom, a radial base ring section attached to the lower end of the axial ring section and extending outwardly therefrom, and means connecting the radial base ring section to the lower end of the frustro-conical wall portion.
Claim 3
Dependent Claim
33 words
The improvement according to claim 1, wherein the conical section is provided with ribs extending upwardly from the base of the cone toward its apex whereby the cone is stiffened by the ribs.
Claim 4
Dependent Claim
40 words
The improvement according to claim 1, wherein the wall of the upper part of the conical portion of the expansible bottom is thicker than the wall of the lower portion so as to resist eversion of the entire conical portion.
References Cited (Backward Citations)
FR1119542A
Cited
US2971671A
Cited
FR1192391A
Cited
US3043461A
Cited
US3374922A
Cited
FR1385421A
Cited
US3430805A
Cited
US3426939A
Cited
US3409167A
Cited
US3904069A
Cited
US3881621A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |