Patent US3560606A successfully refreshed from Google Patents.
US3560606A
Expired / Lapsed
US
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Process for preparing drawn polyamide films
Assignee: Nippon Rayon Co Ltd
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Filing: 1968-07-23
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Granted: 1971-02-02
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Expires: 1988-07-23
Abstract
Abstract POLYAMIDE FILM IS PROCESSED BY ADDING 1 TO 6% BY WEIGHT WATER, PREHEATING AND THEN BIAXIALLY DRAWING AT A TEMPERATURE AT LEAST 5*C. HIGHER THAN THE PREHEATING TEMPERATURE. DURING PREHEATING A SUBSTANTIAL DIFFERENCE IN WATER CONTENT BETWEEN THE INTERIOR AND SURFACE OF THE FILM IS CREATED. THE FILMS MADE BY THIS PROCESS HAVE A RELATIVELY LOW FRICTION COEFFICIENT.
Inventors
- 👤 Mutsuo Kuga
- 👤 Kayomon Kyo
- 👤 Takeshi Mashimo
- 👤 Wakuo Matsumura
- 👤 Hiroshi Kayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:46
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/10; B29C55/12; B29C55/16; B29C71/00; B29K; B29K2077/00
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |