US2537352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyestuffs from phthalimide derivatives
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1947-08-26
•
Granted: 1951-01-09
•
Expires: 1967-08-26
Abstract
No abstract record available.
Inventors
- 👤 Jones William Owen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:20
CPC Classifications
C; C07; C07D; C07D417/00; C07D417/02; C07D417/12; C07D209/00; C07D209/02; C07D209/44; C07D209/50; C09; C09B; C09B57/00; C09B57/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
NEW COMPOUNDS HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
6 words
NEW COMPOUNDS HAVING THE GENERAL FORMULA:
References Cited (Backward Citations)
US647279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |