US2746955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of azo dyestuffs
Assignee: GAF Chemicals Corp
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Filing: 1952-06-03
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Granted: 1956-05-22
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Expires: 1972-06-03
Abstract
No abstract record available.
Inventors
- 👤 William H Armento
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:45
CPC Classifications
C; C09; C09B; C09B41/00; C09B33/00; C09B33/02; C09B35/00; C09B35/02; C09B35/039; C09B35/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
IN THE PROCESS OF MANUFACTURING AZO DYESTUFFS WHEREIN A DIAZO COMPOUND, WHICH IS UNSTABLE AT TEMPERATURE ABOVE 30* C. IS COUPLED UNDER ALKALINE CONDITIONS WITH A COUPLING COMPONENT; THE IMPROVEMENT, WHICH COMPRISES ADDING SAID DIAZO COMPOUND, AT A TEMPERATURE BELOW 30* C. AND AT WHICH IT IS STABLE, TO AN ALKALINE SOLUTION OF THE COUPLING COMPONENT MAINTAINED AT ALKALINE CONDITIONS, AND AT A TEMPERATURE WITHIN THE RANGE OF 40 TO 55* C. DURING SUCH ADDITION.
Claim 2
Dependent Claim
75 words
IN THE PROCESS OF MANUFACTURING AZO DYESTUFFS WHEREIN A DIAZO COMPOUND, WHICH IS UNSTABLE AT TEMPERATURE ABOVE 30* C. IS COUPLED UNDER ALKALINE CONDITIONS WITH A COUPLING COMPONENT; THE IMPROVEMENT, WHICH COMPRISES ADDING SAID DIAZO COMPOUND, AT A TEMPERATURE BELOW 30* C. AND AT WHICH IT IS STABLE, TO AN ALKALINE SOLUTION OF THE COUPLING COMPONENT MAINTAINED AT ALKALINE CONDITIONS, AND AT A TEMPERATURE WITHIN THE RANGE OF 40 TO 55* C. DURING SUCH ADDITION.
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) | 1959-05-22 | 1959-11-21 | 1960-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-22 | 1963-11-21 | 1964-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-22 | 1967-11-21 | 1968-05-22 | $7700.00 | Window Closed / Lapsed |