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US3632728A
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Simultaneous biaxial drawing process for polyamide films
Assignee: Nippon Rayon Co Ltd
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Filing: 1968-12-31
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Granted: 1972-01-04
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Expires: 1988-12-31
Abstract
Abstract PROCESS FOR IMPROVING THE UNIFORMITY OF BIAXIALLY DRAWN POLYAMIDE FILM BY MAZIMIZING THE TRANSVERSE TO LONGITUDINAL DRAW MAGNIFICATIONS DURING THE FIRST 40% OF SIMULTANEOUS BIAXIAL STRETCHING.
Inventors
- 👤 Mutsuo Kuga
- 👤 Takeshi Mashimo
- 👤 Yoshihiko Yano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:29
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/10; B29C55/12; B29C55/16; B29C71/00; B29K; B29K2077/00
Claims Analysis
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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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |