US3249576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elastomeric polyurethanes derived from polyethers or polyesters, diisocyanates and bis-(aminooxy) alkanes
Assignee: Rhone Poulenc SA
•
Filing: 1963-07-01
•
Granted: 1966-05-03
•
Expires: 1983-07-01
Abstract
No abstract record available.
Inventors
- 👤 Phelisse Jean Auguste
- 👤 Rollet Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:14
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; D; D01; D01F; D01F6/00; D01F6/58; D01F6/70
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
38 words
SPINNABLE SOLUTIONS IN DIMETHYLFORMAMIDE OF AN ELASTOMERIC POLYURETHANE OBTAINED BY FIRST REACTING (I) A COMPOUND OF FORMULA HO-Z-OH OF MOLECULAR WEIGHT 500 TO 2500 BEING EITHER (A) A POLYESTER MADE BY CONDENSING AN ALIPHATIC CARBOXYLIC ACID OF FORMULA
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) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |