US3853913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Benz-{8 c,d{9 -indolium dyestuffs
Assignee: —
•
Filing: 1972-06-08
•
Granted: 1974-12-10
•
Expires: 1992-06-08
Abstract
Abstract Cationic dyestuffs having one of the groups or WHEREIN R1 and R2 denote hydrogen, an alkyl, cycloalkyl, aralkyl, aryl or amino radical or a heterocyclic ring, R3 denotes an alkyl, cycloalkyl or aralkyl radical, and R3 can be bonded to R1 or R2, are adapted for the use in dyeing and printing natural and synthetic materials.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:19
CPC Classifications
C; C09; C09B; C09B69/00; C07; C07D; C07D209/00; C07D209/56; C07D209/80; C07D209/90; C07D209/92; C09B23/00; C09B23/14; C09B23/145; C09B44/00; C09B44/10; C09B57/00; C09B57/06; C09B69/001
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
5 words
A DYESTUFF OF THE FORMULA
Claim 2
Dependent Claim
5 words
A DYESTUFF OF THE FORMULA
Claim 3
Dependent Claim
5 words
Dyestuff of the general formula
Claim 4
Dependent Claim
5 words
Dyestuff of the general formula
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |