Patent US3741817A successfully refreshed from Google Patents.
Patent US2768971A successfully refreshed from Google Patents.
US2768971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of alkyl-aryl-ureas
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1955-05-16
•
Granted: 1956-10-30
•
Expires: 1975-05-16
Abstract
No abstract record available.
Inventors
- 👤 Jones Richard Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:47
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/18; C07C273/1854; C07C273/1863
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
PROCESS FOR THE MANUFACTURE OF ORGANIC COMPOUNDS OF THE FORMULA:
Claim 2
Dependent Claim
10 words
PROCESS FOR THE MANUFACTURE OF ORGANIC COMPOUNDS OF THE FORMULA:
References Cited (Backward Citations)
US2673877A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-30 | 1960-04-30 | 1960-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-30 | 1964-04-30 | 1964-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-30 | 1968-04-30 | 1968-10-30 | $7700.00 | Window Closed / Lapsed |