US3655848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treatment of interior of parison preform
Assignee: Phillips Petroleum Co
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Filing: 1969-08-18
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Granted: 1972-04-11
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Expires: 1989-08-18
Abstract
Abstract METHOD FOR TREATING THE INTERIOR OF A PARISON PREFORM AND FORMING A BIAXIALLY ORIENTED HOLLOW ARTICLE THEREFROM. PARISON PREFORMS ARE FORMED BY EXTRUDING OLEFIN POLYMER IN TUBE FORM AND CUTTING THE TUBE INTO INDIVIDUAL PREFORMS. THE INTERIOR OF EACH PREFORM IS HEAT TREATED TO MELT THE INTERIOR SURFACE THEREOF TO A DEPTH OF 0.1 TO 15 MILS AND IS THEN QUENCHED. THE TREATED PARSION IS THEN REHEATED TO THE ORIENTATION TEMPERATURE, STRETCHED LONGITUDINALLY, PLACED IN A MOLD AND BLOWN TO THE SHAPE OF THE MOLD.
Inventors
- 👤 Richard K Young
- 👤 Calvin D Dockery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:18
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/08; B29C49/10; B29C49/0005; B29C49/02; B29C49/04; B29C49/04102; B29C49/0411; B29C49/04114; B29C49/42; B29C49/64; B29C49/6409; B29C59/00; B29C59/16; B29C59/165; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0822; B29C2949/00; B29C2949/07; B29C2949/0715; B29C2949/079; B29C2949/08; B29C49/06; B29K; B29K2023/00; B29K2023/10; B29K2023/12; B29K2105/00; B29K2105/25; B29K2105/253; B29K2105/258; B29K2995/00; B29K2995/0018; B29K2995/0022; B29K2995/0026; B29L; B29L2023/00
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |