US4293520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for molding parison for making stretch molded bottle
Assignee: Yoshino Kogyosho Co Ltd
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Filing: 1979-09-18
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Granted: 1981-10-06
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Expires: 1999-09-18
Abstract
Abstract One disadvantage of a biaxially stretched, blow molded bottle of a saturated polyester resin, particularly polyethylene terephthalate, presenting many excellent features and physical properties, lies in its neck portion which is not subjected to stretching during the molding of the bottle, but which is inferior to its body portion in such physical properties and features. This disadvantage is eliminated by molding at least the neck portion of a parison for such a bottle from a biaxially stretched plate of the resinous material from which the bottle is molded, so that both the neck and body portions of the bottle are composed of the duly biaxially stretched material.
Inventors
- 👤 Masao Akutsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:31
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/14; B29C49/00; B29C49/071; B29C51/00; B29C51/08; B29C51/082; B29C43/00; B29C43/32; B29C43/36; B29C43/361; B29C2043/3615; B29C2043/3631; B29C2949/00; B29C2949/07; B29C2949/0715; B29C2949/076; B29C2949/0768; B29C2949/0769; B29C2949/079; B29C2949/08; B29C2949/0801; B29C2949/20; B29C2949/22; B29C2949/24; B29C2949/26; B29C2949/28; B29C43/42; B29C49/02; B29C49/06; B29K; B29K2105/00; B29K2105/25; B29K2105/253
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
182 words
A process for molding a parison for making a stretch molded bottle, comprising heating a material of a saturated polyester resin, particularly polyethylene terephthalate, in the form of a relatively thick flat plate to a temperature at which said material may be biaxially stretched, stretching said material biaxially in four directions to form a stretched material, heating said stretched material again to a temperature at which said material may be biaxially stretched, impact or vacuum molding said stretched material into a short cylindrically shaped, closed bottomed article having a neck portion and a bottom portion, removing said bottom of said article, inserting said neck portion over the base portion of a core, placing about said core and neck portion a mold to define a mold cavity, and molding within said cavity a cylindrically shaped body portion having a closed bottom from the same resinous material as that of which said neck portion is made, said body portion having an inside diameter equal to the inside diameter of said neck portion and being integrally united with said neck portion to form a parison.
Claim 2
Dependent Claim
182 words
A process for molding a parison for making a stretch molded bottle, comprising heating a material of a saturated polyester resin, particularly polyethylene terephthalate, in the form of a relatively thick flat plate to a temperature at which said material may be biaxially stretched, stretching said material biaxially in four directions to form a stretched material, heating said stretched material again to a temperature at which said material may be biaxially stretched, impact or vacuum molding said stretched material into a short cylindrically shaped, closed bottomed article having a neck portion and a bottom portion, removing said bottom of said article, inserting said neck portion over the base portion of a core, placing about said core and neck portion a mold to define a mold cavity, and molding within said cavity a cylindrically shaped body portion having a closed bottom from the same resinous material as that of which said neck portion is made, said body portion having an inside diameter equal to the inside diameter of said neck portion and being integrally united with said neck portion to form a parison.
Claim 3
Dependent Claim
209 words
A process for making a biaxially stretch molded bottle, comprising heating a material of a saturated polyester resin, particularly polyethylene terephthalate, in the form of a relatively thick flat plate to a temperature at which said material may be biaxially stretched, stretching said material biaxially in four directions to form a stretched material, heating said stretched material again to a temperature at which said material may be biaxially stretched, impact or vacuum molding said stretched material into a short cylindrically shaped, closed bottom article having a neck portion and a bottom portion, removing said bottom of said article, inserting said neck portion over the base portion of a core, placing about said core and neck portion a mold to define a mold cavity, and molding within said cavity a cylindrically shaped body portion having a closed bottom from the same resinous material as that of which said neck portion is made, said body portion having an inside diameter equal to the inside diameter of said neck portion and being integrally united with said neck portion to form a parison, placing said parison in a blow mold, heating said parison to a temperature at which said parison may be biaxially stretched, and blow molding said heated parison into a bottle.
Claim 4
Dependent Claim
209 words
A process for making a biaxially stretch molded bottle, comprising heating a material of a saturated polyester resin, particularly polyethylene terephthalate, in the form of a relatively thick flat plate to a temperature at which said material may be biaxially stretched, stretching said material biaxially in four directions to form a stretched material, heating said stretched material again to a temperature at which said material may be biaxially stretched, impact or vacuum molding said stretched material into a short cylindrically shaped, closed bottom article having a neck portion and a bottom portion, removing said bottom of said article, inserting said neck portion over the base portion of a core, placing about said core and neck portion a mold to define a mold cavity, and molding within said cavity a cylindrically shaped body portion having a closed bottom from the same resinous material as that of which said neck portion is made, said body portion having an inside diameter equal to the inside diameter of said neck portion and being integrally united with said neck portion to form a parison, placing said parison in a blow mold, heating said parison to a temperature at which said parison may be biaxially stretched, and blow molding said heated parison into a bottle.
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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) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |