Patent US3345341A successfully refreshed from Google Patents.
Patent US3581344A successfully refreshed from Google Patents.
US3581344A
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US
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Apparatus for the preparation of biaxially oriented film
Assignee: Dow Chemical Co
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Filing: 1969-05-16
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Granted: 1971-06-01
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Expires: 1989-05-16
Abstract
Abstract BIAXIALLY ORIENTED THERMOPLASTIC RESINOUS FILM IS PREPARED BY EXTRUDING A TUBE, STRETCHING THE TUBE BY MEANS OF GENERALLY COAXIALLY ARRANGED TORI, AT LEAST THE OUTERMOST TOROUS BEING DRIVEN IN FRICTIONAL ENGAGEMENT WITH THE FILM BEING PREPARED.
Inventors
- 👤 Edward R Sederlund
- 👤 Walter J Schrenk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:26
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/10; B29C55/12; B29C55/16; B26; B26D; B26D3/00; B26D3/001; B29C55/28; B29C55/285
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |