US2744914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyestuffs of the phthalocyanine series and their production
Assignee: Bayer AG
•
Filing: 1951-05-29
•
Granted: 1956-05-08
•
Expires: 1971-05-29
Abstract
No abstract record available.
Inventors
- 👤 Rosch Georg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:38
CPC Classifications
C; C09; C09B; C09B9/00; C09B9/02; C09B1/00; C09B1/16; C09B1/20; C09B1/36; C09B47/00; C09B47/04; C09B47/08; C09B47/24; C09B47/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
THE PROCESS WHICH COMPRISES TREATING AT TEMPERATURES OF FROM ABOUT 0* TO ABOUT 40* C. IN THE PRESENCE OF A HYDROGEN CHLORIDE ACCEPTOR A PHTHALOCYANINE SULFOCHLORIDE WITH THE LEUCO SULFURIC ESTER OF AN ANTHRAQUINONE CONTAINING A BASIC SECONDARY AMINO GROUP AND HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
45 words
THE PROCESS WHICH COMPRISES TREATING AT TEMPERATURES OF FROM ABOUT 0* TO ABOUT 40* C. IN THE PRESENCE OF A HYDROGEN CHLORIDE ACCEPTOR A PHTHALOCYANINE SULFOCHLORIDE WITH THE LEUCO SULFURIC ESTER OF AN ANTHRAQUINONE CONTAINING A BASIC SECONDARY AMINO GROUP AND HAVING THE GENERAL FORMULA
References Cited (Backward Citations)
US2300572A
Cited
US2493724A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-08 | 1959-11-07 | 1960-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-08 | 1963-11-07 | 1964-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-08 | 1967-11-07 | 1968-05-08 | $7700.00 | Window Closed / Lapsed |