US3787476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Styryl dyestuffs
Assignee: Bayer AG
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Filing: 1966-01-06
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Granted: 1974-01-22
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Expires: 1986-01-06
Abstract
Abstract DYESTUFFS OF THE FORMULA R1-O-A-(CO)M-O-B-N(-R)-(3-D-1,4-PHENYLENE)-CH=C(-Y)-CN WHEREIN R1 IS ALKYL, ALKENYL, ARALKYL, ARYL, CYCLOALKYL, ACYL, OR CARBALKOXY; M IS 0 OR 1; A IS ARYL; B IS ALKYLENE HAVING 2 TO 4 CARBON ATOMS; R IS ALKYL, ARALKYL, OR CYCLOALKYL OR R1-O-A-(CO)M-O-B- D IS HYDROGEN, ALKYL, ALKOXY, OR HALOGEN; Y IS -CN, -SO2-R2, -COO-R3, OR -CO-N(-R4)-R5 R4 AND R5 ARE HYDROGEN, ALKYL, ARALKYL, CYCLOALKYL, OR ARYL; AND R2 AND R3 ARE ALKYL, ARALKYL, CYCLOALKYL, OR ARYL. THE DYESTUFFS ARE FREE FROM SULPHONIC ACID AND CARBOXYLIC ACID GROUPS AND ARE USEFUL FOR DYEING CELLULOSE TRIACETATE, POLYAMIDE, POLYESTER, AND POLYURETHANES.
Inventors
- 👤 E Rohe
- 👤 R Raue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:41
CPC Classifications
C; C07; C07C; C07C255/00; C09; C09B; C09B23/00; C09B23/14; C09B23/143; C09B55/00; C09B55/002
Claims Analysis
Total Claims: 0
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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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |