Patent US3843625A successfully refreshed from Google Patents.
US3843625A
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US
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Pyrazole azo dyestuffs containing a sulfonylurea or sulfonylurethane substituent
Assignee: Novartis AG
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Filing: 1971-12-15
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Granted: 1974-10-22
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Expires: 1991-12-15
Abstract
Abstract Pyrazole azo dyestuffs of the formula: WHEREIN D is an optionally substituted phenyl group, X1 is -OH or -NH2, X is an oxygen atom or an optionally substituted, nitrogen atom R is hydrogen, alkyl, or aryl, R2 is aryl, and WHEREIN THE PRYAZOLE RING MAY BE OPTIONALLY SUBSTITUTED IN THE 3-POSITION. The dyestuffs of this invention are free of sulfonic acid groups and are sparingly soluble or insoluble in water. The dyestuffs are especially useful for dyeing and printing synthetic fibers particularly polyester fibers in fast yellow shades with excellent fastness to light, and to sublimation.
Inventors
- 👤 N Desai
- 👤 K Artz
- 👤 N Naik
- 👤 O Jayaraman
- 👤 V Ramanthan
- 👤 W Jenny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:49
CPC Classifications
C; C09; C09B; C09B5/00; C09B23/00; C09B23/14; C09B23/143; C09B29/00; C09B29/34; C09B29/36; C09B29/3604; C09B29/3647; C09B29/3652; C09B29/366; C09B39/00; C09B43/00; C09B43/18; C09B43/20; C09B43/206; C09B44/00; C09B44/02; C09B44/04; C09B51/00; C09B62/00; C09B62/44; C09B62/443; C09B62/78; C09B69/00; C09B69/001
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
12 words
A DYESTUFF WHICH IS FREE FROM SULFONIC ACID GROUPS AND WHICH HAS
Claim 2
Dependent Claim
12 words
A DYESTUFF WHICH IS FREE FROM SULFONIC ACID GROUPS AND WHICH HAS
Claim 3
Dependent Claim
8 words
A dyestuff of claim 1 of 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) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |