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Patent US3409598A successfully refreshed from Google Patents.
US3409598A
Expired / Lapsed
US
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Process for the manufacture of water soluble polyvinyl alcohol film
Assignee: Denka Co Ltd
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Filing: 1965-03-01
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Granted: 1968-11-05
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Expires: 1985-03-01
Abstract
No abstract record available.
Inventors
- 👤 Takigawa Bin
- 👤 Yoshida Minoru
- 👤 Miyoshi Shigeto
- 👤 Tanaka Hideyuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:48
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2386347A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |