Patent US3576929A successfully refreshed from Google Patents.
US3576929A
Expired / Lapsed
US
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Method for cooling blown polymer films
Assignee: Dow Chemical Co
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Filing: 1968-06-21
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Granted: 1971-04-27
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Expires: 1988-06-21
Abstract
Abstract THIS INVENTION RELATS TO THE COOLING OF BLOWN POLYMER FILM BY SPRAYNG A RELATIVELY LOW BOILING POINT LIQUID ONTO THE FILM, THEREBY CAUSING COOLING AND SOLIDIFICATION OF THE HEAT PLASTIFIED POLYMER. THE VAPORIZED LIQUID COOLANT IS CONDENSED ON THE EXTERIOR WALL OF A COOLING CHAMBER WHICH SURROUNDS THE BLOWN FILM AND THE CONDENSATE IS COLLECTED AND RE-CYCLED.
Inventors
- 👤 Robert Burton Turner
- 👤 Emilio Lawrence Poli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:06
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/885; B29C48/03; B29C48/09; B29C48/10; B29C48/911; B29C48/9115; B29C48/912
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |