Patent US4497855A successfully refreshed from Google Patents.
US4497855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collapse resistant polyester container for hot fill applications
Assignee: Ardagh Metal Packaging Germany GmbH
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Filing: 1981-05-06
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Granted: 1985-02-05
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Expires: 2001-05-06
Abstract
Abstract A collapse resistant polyester container is provided for hot fill applications employing product fill temperatures up to about 190° F. (87.8° C.) or more. The container has at least one region which is thermoelastically deformable inwardly after the container is hot filled and sealed to offset the pressure forces which tend to collapse the container as the contents cool and create an internal vacuum. The thermoelastic region is preferably formed in a two step molding process in which the region is formed and heat set at a first position and then reformed outwardly to a second position and cooled in that position.
Inventors
- 👤 Purushottam D. Agrawal
- 👤 John F. Mandell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:42
CPC Classifications
E; E04; E04G; E04G21/00; E04G21/14; E04G21/16; B; B65; B65D; B65D1/00; B65D1/02; B65D1/0223; B29; B29C; B29C2949/00; B29C2949/07; B29C2949/081; B29C2949/0811; B29C49/00; B29C49/42; B29C49/64; B29C49/6604; B29C49/6605; B29K; B29K2995/00; B29K2995/0037; B29K2995/004; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1397
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
39 words
A collapse-resistant, molecularly oriented, heat set polyester container having at least one preselected inwardly thermoelastically deformable region for at least partially relieving negative pressure tending to collapse the container when hot filled, sealed and the contents allowed to cool.
Claim 2
Dependent Claim
39 words
A collapse-resistant, molecularly oriented, heat set polyester container having at least one preselected inwardly thermoelastically deformable region for at least partially relieving negative pressure tending to collapse the container when hot filled, sealed and the contents allowed to cool.
Claim 3
Dependent Claim
50 words
A collapse-resistant, oriented heat set polyester container for use in hot fill applications comprising sidewalls and a base, said base being inwardly thermoelastically deformable to at least partially relieve pressure forces which tend to collapse the container when the container is hot filled, sealed and the contents allowed to cool.
Claim 4
Dependent Claim
50 words
A collapse-resistant, oriented heat set polyester container for use in hot fill applications comprising sidewalls and a base, said base being inwardly thermoelastically deformable to at least partially relieve pressure forces which tend to collapse the container when the container is hot filled, sealed and the contents allowed to cool.
Claim 5
Dependent Claim
54 words
The container of claim 2 wherein said sidewalls have at least about 35% crystallinity and said base has from about 28% to about 32% crystallinity, said container exhibiting a transmission haze percent of less than about 25%, and a volumetric shrinkage of less than about 1% at product filling temperatures of about 190° F.
Claim 6
Dependent Claim
17 words
The container of claim 1 wherein said inwardly thermoelastically deformable region is the base of said container.
Claim 7
Dependent Claim
14 words
The container of claims 1, 2 or 3 wherein said polyester is polyethylene terephthalate.
Claim 8
Dependent Claim
16 words
The container of claims 2 or 3 wherein said sidewalls have integral stiffening members molded therein.
Claim 9
Dependent Claim
28 words
The container of claims 2, 3, or 4 wherein said base has a plurality of stress points molded therein to facilitate the uniform thermoelastic deformation of said base.
Claim 10
Dependent Claim
22 words
The container of claims 2 or 3 wherein said sidewalls have at least one preselected substantially planar pressure deformable region molded therein.
Claim 11
Dependent Claim
20 words
The container of claims 1, 2 or 3 having a capacity of from about 120 to about 3780 cubic centimeters.
Claim 12
Dependent Claim
12 words
The container of claims 1, 2 or 3 which is vertically self-supporting.
Claim 13
Dependent Claim
15 words
The container of claims 1, 2 or 3 including an environmentally sensitive substance packaged therein.
Claim 14
Dependent Claim
12 words
The container of claim 6 including an environmentally sensitive substance packaged therein.
Claim 15
Dependent Claim
12 words
The container of claim 8 including an environmentally sensitive substance packaged therein.
Claim 16
Independent Claim
40 words
A method of packaging an environmentally sensitive substance which comprises the steps of filling a container according to claims 1, 2 or 3 with said substance at an elevated temperature and sealing said container before said filled substance cools appreciably.
Claim 17
Dependent Claim
13 words
The method of claim 14 wherein said elevated temperature is about 190° F.
Claim 18
Dependent Claim
15 words
The container of claim 1 wherein said region deforms toward the opening of the container.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-05 | 1988-08-06 | 1989-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-05 | 1992-08-06 | 1993-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-05 | 1996-08-06 | 1997-02-05 | $7700.00 | Window Closed / Lapsed |