US3484409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyvinyl formal
Assignee: Kuraray Co Ltd
•
Filing: 1965-10-21
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Granted: 1969-12-16
•
Expires: 1985-10-21
Abstract
No abstract record available.
Inventors
- 👤 Tadao Ashikaga
- 👤 Hirotoshi Kurashige
- 👤 Takeo Endoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:38
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/28; C08F216/00; C08F216/38; C08F8/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-15 | 1973-06-16 | 1973-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-15 | 1977-06-16 | 1977-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-15 | 1981-06-16 | 1981-12-16 | $7700.00 | Window Closed / Lapsed |