US3139422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azo dyestuffs
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1963-03-25
•
Granted: 1964-06-30
•
Expires: 1983-03-25
Abstract
No abstract record available.
Inventors
- 👤 Booth Gerald
- 👤 Douglas George Trapp
- 👤 Hunter James Stuart
- 👤 Johnson Eric Leslie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:13
CPC Classifications
C; C09; C09B; C09B62/00; C09B62/002; C09B62/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
4 words
DYESTUFFS HAVING THE FORMULA:
Claim 2
Dependent Claim
4 words
DYESTUFFS HAVING THE FORMULA:
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) | 1967-06-30 | 1967-12-30 | 1968-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-30 | 1971-12-30 | 1972-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-30 | 1975-12-30 | 1976-06-30 | $7700.00 | Window Closed / Lapsed |