Patent US3642718A successfully refreshed from Google Patents.
US3642718A
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US
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Polymers containing hydroxyl groups
Assignee: BASF SE
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Filing: 1969-09-08
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Granted: 1972-02-15
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Expires: 1989-09-08
Abstract
Abstract POLYMERS CONTAINING TERTIARY HYDROXYL GROUPS, AND THEIR PRODUCTION BY POLYMERIZING UNSATURATED LACTIC ACIDS OR COPOLYMERIZING SUCH ACIDS WITH OTHER OLEFINICALLY UNSATURATED MONOMERS.
Inventors
- 👤 Herbert Naarmann
- 👤 Hans Kiefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:00
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/04; C08F20/06; Y; Y10; Y10S; Y10S260/00; Y10S260/15; Y10S260/17
Claims Analysis
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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) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |