US2964562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water insoluble colorants
Assignee: Individual
•
Filing: 1957-06-03
•
Granted: 1960-12-13
•
Expires: 1977-06-03
Abstract
No abstract record available.
Inventors
- 👤 Landau Milton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:24
CPC Classifications
C; C09; C09B; C09B37/00; Y; Y10; Y10S; Y10S534/00; Y10S534/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
THE PRODUCT OBTAINED BY REACTING A NAPHTHYLAMINE SELECTED FROM THE GROUP CONSISTING OF A-NAPHTHYLAMINE AND B-NAPHTHYLAMINE WITH NITROUS ACID IN THE ABSENCE OF AN OTHER MINERAL ACID AT A TEMPERATURE IN THE RANGE 30*C. TO 70*C. TO FORM A BROWNISH PRECIPITATE AND HEATING THE RESULTING PRECIPITATE UNTIL IT TURNS GREEN, SAID PRODUCT BEING INSOLUBLE IN WATER AND PRODUCING A DARK BROWN SOLUTION IN METHYL ACETATE.
Claim 2
Dependent Claim
65 words
THE PRODUCT OBTAINED BY REACTING A NAPHTHYLAMINE SELECTED FROM THE GROUP CONSISTING OF A-NAPHTHYLAMINE AND B-NAPHTHYLAMINE WITH NITROUS ACID IN THE ABSENCE OF AN OTHER MINERAL ACID AT A TEMPERATURE IN THE RANGE 30*C. TO 70*C. TO FORM A BROWNISH PRECIPITATE AND HEATING THE RESULTING PRECIPITATE UNTIL IT TURNS GREEN, SAID PRODUCT BEING INSOLUBLE IN WATER AND PRODUCING A DARK BROWN SOLUTION IN METHYL ACETATE.
References Cited (Backward Citations)
CH151561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-13 | 1964-06-13 | 1964-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-13 | 1968-06-13 | 1968-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-13 | 1972-06-13 | 1972-12-13 | $7700.00 | Window Closed / Lapsed |