US3567661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane products prepared from oxyalkylene condensates of cellulose and method of producing same
Assignee: Wyandotte Chemicals Corp
•
Filing: 1967-06-15
•
Granted: 1971-03-02
•
Expires: 1987-06-15
Abstract
Abstract A POLYURETHANE PRODUCT AND METHOD OF PRODUCING SAME BY COREACTING A MIXTURE OF AN ORGANIC POLYISOCYANATE AND POLYOXYALKYLENE CONDENSATE OF CELLULOSE. THE POLYOXYALKYLENE CONDENSATE OF CELLULOSE IN TURN COMPRISES THE REACTION PRODUCT OF AT LEAST ONE ALKYLENE OXIDE WITH CELLULOSIC MATERIAL IN THE PRESENCE OF A HIGH MOLECULAR WEIGHT POLYOXYALKYLENE ALCOHOL DERIVATIVE.
Inventors
- 👤 John T Patton Jr
- 👤 Henry E Reich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:28
CPC Classifications
C; C08; C08B; C08B15/00; C08B15/05; C08B15/06; C08B11/00; C08B11/02; C08B11/04; C08B11/08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/487; C08G18/4883; C08G18/64; C08G18/6484; C08G2110/00; C08G2110/0008; C08G2110/0025; C08G2110/0083
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |