US3381008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of aryl and aralkyl isocyanates
Assignee: WR Grace and Co
•
Filing: 1966-08-24
•
Granted: 1968-04-30
•
Expires: 1986-08-24
Abstract
No abstract record available.
Inventors
- 👤 Paul R Steyermark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:42
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/02; C08G18/022; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/791; C08G18/794
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
IN THE METHOD OF PREPARING A POLYMERIC PRODUCT FROM A FEED COMPRISING AT LEAST ONE ISOCYANATE OF THE FORMULA
Claim 2
Dependent Claim
19 words
IN THE METHOD OF PREPARING A POLYMERIC PRODUCT FROM A FEED COMPRISING AT LEAST ONE ISOCYANATE OF THE FORMULA
References Cited (Backward Citations)
US3330828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |