US3560464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melt-formable polyvinyl alcohols
Assignee: Kuraray Co Ltd
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Filing: 1966-09-29
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Granted: 1971-02-02
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Expires: 1986-09-29
Abstract
Abstract A METHOD IS DISCLOSED BY WHICH POLYVINYL ALCOHOL MOLDINGS ARE FORMED. A POLYVINYL ALCOHOL HAVING ABOUT 4 TO 15 MOL PERCENT OF SIDE CHAIN ALKYL GROUPS OF ABOUT 4 TO 20 CARBON ATOMS, BASED ON THE TOTAL NUMBER OF CARBON ATOMS IN THE MAIN POLYMER CHAIN HAVING SUBSTITUENTS OTHER THAN HYDROGEN, IS MELT EXTRUDED INTO A SHAPED PRODUCT. THE SIDE CHAIN MAY HAVE STRUCTRE -OR, -OOC-R, -O-CH(-R'')-O-, -R, WHEREIN R AND R'' ARE ALKYL.
Inventors
- 👤 Kentaro Toyoshima
- 👤 Saburo Imoto
- 👤 Hirosaburo Mori
- 👤 Osamu Ohara
- 👤 Hiroshi Harima
- 👤 Shunji Miyake
- 👤 Taiji Ozaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:25
CPC Classifications
C; C08; C08L; C08L29/00; C08L29/02; C08L29/04; C08F; C08F8/00; C08F8/12; C08F8/28; C08F2800/00; C08F2800/20
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) | 1974-02-01 | 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 |