US2834773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of copperized azo dyestuffs
Assignee: Wyeth Holdings LLC
•
Filing: 1952-09-23
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Granted: 1958-05-13
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Expires: 1972-09-23
Abstract
No abstract record available.
Inventors
- 👤 Scalera Mario
- 👤 Brody Frederick
- 👤 Fazio Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:21
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0072
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
A STORAGE-STABLE COMPOSITION COMPRISING THE DYESTUFF OBTAINED BY COUPLING TETRAZOTIZED DIANISIDINE WITH 1-AMINO-8-NAPHTHOL-2,4-DISULFONIC ACID AND COPPERIZING, AND A WATER-SOLUBLE ALIPHATIC AMINOPOLYCARBOXYLIC ACID SEQUESTERING AGENT IN AN AMOUNT OF AT LEAST 1% AND NOT EXCEEDING ABOUT 10% OF THE WEIGHT OF THE DYESTUFF.
Claim 2
Dependent Claim
42 words
A STORAGE-STABLE COMPOSITION COMPRISING THE DYESTUFF OBTAINED BY COUPLING TETRAZOTIZED DIANISIDINE WITH 1-AMINO-8-NAPHTHOL-2,4-DISULFONIC ACID AND COPPERIZING, AND A WATER-SOLUBLE ALIPHATIC AMINOPOLYCARBOXYLIC ACID SEQUESTERING AGENT IN AN AMOUNT OF AT LEAST 1% AND NOT EXCEEDING ABOUT 10% OF THE WEIGHT OF THE DYESTUFF.
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) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |