US4367187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of blow molded articles
Assignee: Daido Sanso Co Ltd
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Filing: 1981-04-30
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Granted: 1983-01-04
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Expires: 2001-04-30
Abstract
Abstract In a blow molding process in which a parison is blown to form an article which is then cooled and recovered, a liquified gas is introduced into the interior of partially blown article where it becomes vaporized and causes the completion of the blowing step as well as to cool the article. A mixture of the blowing gas and vaporized liquified gas is recovered and recycled for use as the blowing gas in a subsequent blow molding step.
Inventors
- 👤 Hatahiko Fukushima
- 👤 Tadahiko Handa
- 👤 Kiyoshi Ochiai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:42
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/46; B29C49/02; B29C49/04; B29C49/18; B29C49/64; B29C49/66; B29C35/00; B29C35/16; B29C2035/1616; B29C2035/1625; B29C2035/165; B29C2049/4602; B29C2049/4605; B29C2049/4608; B29C2049/4611; B29C2049/4617; B29C2049/4623; B29C49/4284; B29C49/42845; B29C49/42855; Y; Y02; Y02P; Y02P70/00; Y02P70/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
In a process for the production of blow molded thermoplastic articles comprising the steps of extruding a thermoplastic in a molten state to form a parison, blowing said parison within a closed mold to conform its walls to the contour of said mold, cooling said resulting blow molded article, and recovering the cooled article, the improvement which comprises: (a) introducing a liquefied nitrogen gas into said parison as it is being blown with a blowing gas, (b) vaporizing said liquefied gas from the heat of the molten parison to cause said parison to conform to the contours of said mold and to cool said blow molded article, (c) recovering a portion of the resulting mixture of said blowing gas and vaporized liquefied gas, (d) using said recovered portion of said mixture as at least a portion of the blowing gas during a subsequent blowing step, and (e) releasing the remaining portion of said mixture from said blow molded article.
Claim 2
Dependent Claim
159 words
In a process for the production of blow molded thermoplastic articles comprising the steps of extruding a thermoplastic in a molten state to form a parison, blowing said parison within a closed mold to conform its walls to the contour of said mold, cooling said resulting blow molded article, and recovering the cooled article, the improvement which comprises: (a) introducing a liquefied nitrogen gas into said parison as it is being blown with a blowing gas, (b) vaporizing said liquefied gas from the heat of the molten parison to cause said parison to conform to the contours of said mold and to cool said blow molded article, (c) recovering a portion of the resulting mixture of said blowing gas and vaporized liquefied gas, (d) using said recovered portion of said mixture as at least a portion of the blowing gas during a subsequent blowing step, and (e) releasing the remaining portion of said mixture from said blow molded article.
References Cited (Backward Citations)
USRE28497E
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-03 | 1986-07-05 | 1987-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-03 | 1990-07-05 | 1991-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-03 | 1994-07-05 | 1995-01-04 | $7700.00 | Window Closed / Lapsed |