Patent US3788802A successfully refreshed from Google Patents.
US3788802A
Expired / Lapsed
US
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Paper dyed with water soluble benzothi-azolylphenylazobarbituric acid dyestuffs
Assignee: Bayer Corp
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Filing: 1973-02-15
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Granted: 1974-01-29
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Expires: 1993-02-15
Abstract
Abstract MONOAZO DYESTUFFS OF THE FORMULA 2-(4-((2(Z=),4,6-DI(O=)HEXAHYDROPYRIMIDIN-5-YL)-N=N-),Y, Q-PHENYL),4-X,6-R2,R1-BENZOTHIAZOLE WHEREIN R1, X AND Y ARE HYDROGEN, LOWER ALKOXY OR LOWER ALKYL; R2 AND Q ARE H OR SO3H WITH AT LEAST ONE BEING SO3H; AND Q IS OXYGEN, SULFUR, IMINO, OR LOWER ALKYL IMINO. THESE DYESTUFFS COLOR PAPER AND PAPER PULP IN ATTRACTIVE GREENISH YELLOW SHADES BUT HAVE LITTLE AFFINITY FOR COTTON, SAID PAPER DYEINGS BEING ALKALI- AND ACID-FAST AND DISCHARGED ON CONTACT WITH CONVENTIONAL BLEACHING AGENTS.
Inventors
- 👤 A Litke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:21
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/0025; D; D06; D06P; D06P1/00; D06P1/02; D06P1/04; D06P1/06; Y; Y10; Y10S; Y10S8/00; Y10S8/916; Y10S8/919
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |