US3741995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anthraquinone pigments
Assignee: Novartis AG
•
Filing: 1971-03-17
•
Granted: 1973-06-26
•
Expires: 1991-03-17
Abstract
Abstract Compounds of the formula WHEREIN R is methyl, methoxy or chlorine. WHEREIN R is methyl, methoxy or chlorine.
Inventors
- 👤 A Pugin
- 👤 K Burdeska
- 👤 E Model
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:00
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/36; C09B1/42
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
9 words
The pigment of claim 1 wherein R represents methoxy.
Claim 2
Dependent Claim
9 words
The pigment of claim 1 wherein R represents chlorine.
Claim 3
Dependent Claim
9 words
The pigment of claim 1 wherein R represents methyl.
References Cited (Backward Citations)
US2041550A
Cited
US2833789A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |