US3454620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacture of urethanes from hydroxyl group containing compound,nitrogenous compound and carbon monoxide in presence of transition metal compound
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1966-11-04
•
Granted: 1969-07-08
•
Expires: 1986-11-04
Abstract
No abstract record available.
Inventors
- 👤 George Albert Gamlen
- 👤 Arthur Ibbotson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:19
CPC Classifications
C; C08; C08G; C08G71/00; B; B01; B01J; B01J31/00; B01J31/16; B01J31/22; B01J31/2282; B01J31/2295; B01J31/26; B01J31/28; B01J31/30; C08L; C08L75/00; B01J2531/00; B01J2531/80; B01J2531/82; B01J2531/822
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3245774A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-07 | 1973-01-06 | 1973-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-07 | 1977-01-06 | 1977-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-07 | 1981-01-06 | 1981-07-08 | $7700.00 | Window Closed / Lapsed |