US2539178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallized azo dyestuff and process of producing the same
Assignee: GAF Chemicals Corp
•
Filing: 1947-11-06
•
Granted: 1951-01-23
•
Expires: 1967-11-06
Abstract
No abstract record available.
Inventors
- 👤 Bestehorn Heinrich Hugo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:59
CPC Classifications
C; C09; C09B; C09B45/00; C09B45/01
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
48 words
THE PROCESS OF METALLIZING AN AZO DYE DERIVED FROM 2 MOLS OF DIAZOTIZED ANILINE AND 1 MOL OF THE UREA OF 2-AMINO-5-NAPHTHOL-7-SULFONIC ACID, WHICH COMPRISES HEATING THE DYESTUFF TO A TEMPERATURE OF 30* C. IN AN AQUEOUS ALKALINE SOLUTION IN THE PRESENCE OF COPPER SULFATE AND PERFORMIC ACID.
References Cited (Backward Citations)
DE287149C
Cited
US662122A
Cited
US2045090A
Cited
US2124881A
Cited
US2150772A
Cited
US2277551A
Cited
US2396328A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-22 | 1954-07-24 | 1955-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-22 | 1958-07-24 | 1959-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-22 | 1962-07-24 | 1963-01-23 | $7700.00 | Window Closed / Lapsed |