Patent US4249667A successfully refreshed from Google Patents.
US4249667A
Expired / Lapsed
US
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Plastic container with a generally hemispherical bottom wall having hollow legs projecting therefrom
Assignee: Graham Packaging Pet Technologies Inc
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Filing: 1979-10-25
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Granted: 1981-02-10
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Expires: 1999-10-25
Abstract
Abstract This disclosure relates to improvements in the cross section of a bottom end of a plastic bottle suitable for packaging liquids under internal pressures. The bottom end is primarily one which includes a generally hemispherical bottom wall having projecting therefrom in circumferentially spaced relation hollow legs terminating in supporting feet. The bottom end is stiffened against creep of the plastic material over a period of time under the influence of the internal pressure by changing the configuration of the bottom wall from that of a hemisphere to one which includes a configuration of straight line sections and curved line sections when viewed in radial cross section along the axis of the bottle.
Inventors
- 👤 John F. E. Pocock
- 👤 Suppayan M. Krishnakumar
- 👤 Gautam K. Mahajan
- 👤 Richard E. Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:25
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/66; B; B65; B65D; B65D1/00; B65D1/02; B65D1/0223; B65D1/0261; B65D1/0284
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
112 words
In a blow molded plastic container of the type comprising a tubular body terminating in a generally hemispherical outwardly convex bottom wall, said bottom wall being interrupted by a plurality of circumferentially spaced hollow legs with portions of said bottom wall disposed therebetween and terminating in a lower polar portion, said hollow legs terminating in lowermost supporting feet the improvement comprising said bottom wall in axial half cross-section between an adjacent pair of said legs being in part of a constant curvature and in part other than of a constant curvature and including a constant curvature curved line portion and an intermediate straight line portion wherein said bottom has a frustoconical segment.
Claim 2
Dependent Claim
112 words
In a blow molded plastic container of the type comprising a tubular body terminating in a generally hemispherical outwardly convex bottom wall, said bottom wall being interrupted by a plurality of circumferentially spaced hollow legs with portions of said bottom wall disposed therebetween and terminating in a lower polar portion, said hollow legs terminating in lowermost supporting feet the improvement comprising said bottom wall in axial half cross-section between an adjacent pair of said legs being in part of a constant curvature and in part other than of a constant curvature and including a constant curvature curved line portion and an intermediate straight line portion wherein said bottom has a frustoconical segment.
Claim 3
Dependent Claim
53 words
The container of claim 1 wherein below said frustoconical bottom segment there is disposed next adjacent a spherical bottom segment including said lower polar portion and said straight line extends tangential from a curved line axial section of said spherical bottom segment, said spherical bottom segment being defined by said curved line portion.
Claim 4
Dependent Claim
40 words
The container of claim 1 wherein said axial half cross-section said bottom wall includes a second straight line portion spaced below said first mentioned intermediate straight line portion with said curved line portion being between said two straight line portions.
Claim 5
Dependent Claim
54 words
The container of claim 3 wherein said curved line portion is a section of a part spherical segment with said part spherical segment being disposed between said frustoconical segment of which said first mentioned intermediate straight line is a section and a lower frustoconical segment of which said second straight line is a section.
Claim 6
Dependent Claim
28 words
The container of claim 4 wherein said bottom wall lower polar portion is in the form of a lowermost part spherical segment disposed below said lower frustoconical segment.
Claim 7
Dependent Claim
50 words
The container of claim 3 wherein said curved line portion is a section of a part spherical segment with said part spherical segment being disposed between said frustoconical segment of which said first mentioned intermediate straight line is a section and a lower planar segment forming said lower polar portion.
Claim 8
Dependent Claim
40 words
The container of claim 1 wherein said bottom wall above said frustoconical segment includes an annular segment defined in cross section by a curved line of a radius materially less than the radius of said constant curvature curved line portion.
Claim 9
Dependent Claim
50 words
The container of claim 7 wherein said bottom wall above said annular segment includes an upper annular segment which blends into said body, said upper annular segment being defined in section by a curved line of a radius materially greater than the radius of said constant curvature curved line portion.
Claim 10
Dependent Claim
13 words
The container of claim 7 wherein said annular segment blends into said body.
Claim 11
Dependent Claim
20 words
The container of claim 1 wherein said lower polar portion is concaved and projects into the interior of said container.
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) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |