Patent US1022894A successfully refreshed from Google Patents.
US3579733A
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Apparatus for variable parison forming
Assignee: Dow Chemical Co
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Filing: 1969-02-05
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Granted: 1971-05-25
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Expires: 1989-02-05
Abstract
Abstract THIS INVENTION RELATES TO APPARATUS FOR CONTROLLING THE DIAMETER AND THICKNESS OF AN EXTRUDED PLASTIC MELT. MORE PARTICULARLY, THIS INVENTION RELATES TO THE CONTROL OF PARISON DIAMETER BY ROTATION OF ONE EXTRUDING DIE MEMBER IN RELATION TO ANOTHER.
Inventors
- 👤 Walter H West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:18
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/02; B29C49/04; B29C49/0411; B29C49/04114; B29C48/00; B29C48/03; B29C48/09; B29C48/25; B29C48/30; B29C48/32; B29C48/325; B29C48/33
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |