US2681345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coloring matters of the tetra-azaporphin series
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1951-01-10
•
Granted: 1954-06-15
•
Expires: 1971-01-10
Abstract
No abstract record available.
Inventors
- 👤 France Harold
- 👤 Jones William Owen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:38
CPC Classifications
C; C09; C09B; C09B47/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
NEW COLOURING MATTERS OF THE FORMULA
Claim 2
Dependent Claim
6 words
NEW COLOURING MATTERS OF THE FORMULA
References Cited (Backward Citations)
US2213726A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-14 | 1957-12-14 | 1958-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-14 | 1961-12-14 | 1962-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-14 | 1965-12-14 | 1966-06-15 | $7700.00 | Window Closed / Lapsed |