US3471594A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of manufacturing polyvinyl alcohol films
Assignee: Kuraray Co Ltd
•
Filing: 1966-07-25
•
Granted: 1969-10-07
•
Expires: 1986-07-25
Abstract
No abstract record available.
Inventors
- 👤 Saburo Kawamura
- 👤 Masaru Takata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:16
CPC Classifications
B; B29; B29D; B29D7/00; B29D7/01; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/25; B29C48/88; B29C48/911; B29C48/9135; B29C48/914
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2239718A
Cited
US2447140A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-06 | 1973-04-07 | 1973-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-06 | 1977-04-07 | 1977-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-06 | 1981-04-07 | 1981-10-07 | $7700.00 | Window Closed / Lapsed |