US3665019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anthraquinone dyestuffs
Assignee: Bayer AG
•
Filing: 1970-02-24
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Granted: 1972-05-23
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Expires: 1990-02-24
Abstract
Abstract WHEREIN X and Y are hydrogen, halogen, methyl, ethyl, methoxy, or ethoxy; R is hydrogen, methyl or ethyl; and R1 is phenylsulfonyl or substituted phenylsulfonyl. Anthraquinone dyestuffs suitable for dyeing natural and synthetic polypeptide fibers, such as silk and polyamide fibers, are provided of the formula:
Inventors
- 👤 Josef Singer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:09
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/26; C09B1/32; C09B1/34; C09B1/343
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
7 words
Dyestuff of claim 1 having the formula
Claim 2
Dependent Claim
7 words
Dyestuff of claim 1 having the formula
Claim 3
Dependent Claim
7 words
Dyestuff of claim 1 having the formula
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |