US2983759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinyl alcohol product and process
Assignee: Kurashiki Rayon Co Ltd
•
Filing: 1959-01-19
•
Granted: 1961-05-09
•
Expires: 1979-01-19
Abstract
No abstract record available.
Inventors
- 👤 Matsumoto Masakazu
- 👤 Shiraishi Makoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:03
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/06; Y; Y10; Y10S; Y10S8/00; Y10S8/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
44 words
A POLYVINYL ALCOHOL DERIVATIVE HAVING A DEGREE OF POLYMERIZATION IN THE RANGE OF 20 TO 40, SAID POLYVINYL ALCOHOL DERIVATIVE CONSISTING ESSENTIALLY OF VINYL ALCOHOL UNITS AND HAVING TERMINAL UNITS CONTAINING CARBONYL GROUPS SELECTED FROM THE CLASS CONSISTING OF ALDEHYDE AND KETONE CARBONYL GROUPS.
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) | 1964-05-08 | 1964-11-07 | 1965-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-08 | 1968-11-07 | 1969-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-08 | 1972-11-07 | 1973-05-09 | $7700.00 | Window Closed / Lapsed |