Patent US483455A successfully refreshed from Google Patents.
US3663659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of hydroxylated block polymers
Assignee: United States Department of Health and Human Services
•
Filing: 1970-05-22
•
Granted: 1972-05-16
•
Expires: 1990-05-22
Abstract
Abstract ELASTIC HYDROXYLATED MONOVINYL ARENE-POLYDIENE-MONOVINYL ARENE BLOCK COPOLYMERS ARE PREPARED BY HYDROBORATION AND SUBSEQUENT OXIDATION TO THE HYDROXYLATED BLOCK COPOLYMER. THE HYDROBROMATING AGENTS INCLUDE DIBORANE, DISIAMYLBORANE AND 9-BOROBICYCLO(3.3.1)NONANE. THESE HYDROXYLATED BLOCK COPOLYMERS HAVE PROPERTIES WHICH ARE USEFUL FOR REINFORCING MATERIAL FOR NATURAL AND SYNTHETIC RUBBER, FOR MODIFICATION OF RUBBER-BASED ADHESIVES AND DUE TO THEIR PARTICULAR SWELLABILITY FOR FABRICATION OF DEVICES FOR SURGICAL IMPLANTATION AND FOR BLOOD CIRCULATION IN ANIMALS.
Inventors
- 👤 William C Kray
- 👤 De Loss E Winkler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:49
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |