US5122327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blow molding method for making a reversely oriented hot fill container
Assignee: Hoover Universal Inc
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Filing: 1991-04-18
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Granted: 1992-06-16
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Expires: 2011-04-18
Abstract
Abstract A blow molded container formed of a polyester resin for use in hot fill applications. The container includes upright side walls, an integral base and a preselected outwardly thermoelastically deformable portion. Upon being filled with a liquid at an elevated temperature, the deformable portion of the container deforms outwardly to partially increase the volumetric size of the container. The remaining portions of the container generally shrink in response to being hot filled.
Inventors
- 👤 Dennis R. Spina
- 👤 Samuel E. Evins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:47
CPC Classifications
B; B65; B65D; B65D1/00; B65D1/02; B65D1/0223; B29; B29C; B29C49/00; B29C49/08; B29C49/10; B29C49/12; B29C49/28; B29C49/30; B29C49/42; B29C49/48; B29C49/4802; B29C67/00; B29C67/0014; B29C2049/4805; B29C2049/4879; B29C2049/4892; B29C2949/00; B29C2949/07; B29C2949/0715; B29C49/02; B29C49/06; B29K; B29K2067/00; B65D2501/00; B65D2501/0009; B65D2501/0018; Y; Y10; Y10S; Y10S264/00; Y10S264/90; Y10S264/904
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
158 words
A method of blow molding a hot fill polyester container, said method comprising the steps of: providing a preform of polyester material; forming said preform into a first configuration of said container by blow molding said preform outward into conformity with interior surfaces defining a mold cavity within a blow molding machine; treating said first configuration of said container with heat by heating said first configuration to a temperature sufficient to induce a predetermined amount of thermal stability into said container; reshaping a portion of said first configuration inwardly of said cavity to form a second configuration of said container, said reshaped portion developing a region of molecularly oriented polyester; cooling said polyester while maintaining said second configuration; and removing said container from said mold cavity thereby providing a container having a reshaped portion, said reshaped portion being outwardly thermoelastically deformable into a predetermined shape in response to being hot filled and as a result of said reshaping.
Claim 2
Independent Claim
158 words
A method of blow molding a hot fill polyester container, said method comprising the steps of: providing a preform of polyester material; forming said preform into a first configuration of said container by blow molding said preform outward into conformity with interior surfaces defining a mold cavity within a blow molding machine; treating said first configuration of said container with heat by heating said first configuration to a temperature sufficient to induce a predetermined amount of thermal stability into said container; reshaping a portion of said first configuration inwardly of said cavity to form a second configuration of said container, said reshaped portion developing a region of molecularly oriented polyester; cooling said polyester while maintaining said second configuration; and removing said container from said mold cavity thereby providing a container having a reshaped portion, said reshaped portion being outwardly thermoelastically deformable into a predetermined shape in response to being hot filled and as a result of said reshaping.
Claim 3
Dependent Claim
41 words
A method as set forth in claim 1 wherein said first configuration is heat treated by heating to a temperature sufficient to induce rapid crystallization in said polyester to heat set said first configuration of said container to a limited extent.
Claim 4
Dependent Claim
24 words
A method as set forth in claim 1 wherein said portion is reshaped by mechanical movement of a mold part corresponding to said portion.
Claim 5
Dependent Claim
15 words
A method as set forth in claim 1 wherein said polyester is polyethylene terephthalate (PET).
Claim 6
Dependent Claim
16 words
A method as set forth in claim 4 wherein said preformed article is of extruded PET.
Claim 7
Dependent Claim
17 words
A method as set forth in claim 4 wherein said preformed article is of injection molded PET.
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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) | 1995-06-16 | 1995-12-16 | 1996-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-16 | 1999-12-16 | 2000-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-16 | 2003-12-16 | 2004-06-16 | $7700.00 | Window Closed / Lapsed |