US2893994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing finely divided vat dye pigments
Assignee: Honeywell International Inc
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Filing: 1956-07-30
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Granted: 1959-07-07
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Expires: 1976-07-30
Abstract
No abstract record available.
Inventors
- 👤 Bertram M Helfaer
- 👤 Frederic L Sievenpiper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:19
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0077
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
THE IMPROVEMENT IN THE PROCESS OF PRODUCING A VAT DYE PIGMENT BY REACTING A LEUCO COMPOUND OF A VAT DYE WITH AN OXIDIZING AGENT WHICH COMPRISES DISPERSING AN AQUEOUS ALKALINE SOLUTION OF A LEUCO COMPOUND OF A VAT DYE INTO FINE DROPLETS, AND OXIDIZING THE LEUCO COMPOUND TO THE VAT DYE AND PRECIPITATING THE RESULTING VAT DYE IN FINELY DIVIDED FORM BY CONTACTING THE DROPLETS OF SOLUTION, WHILE IN DISPERSED FORM, WITH A LIQUID OXIDIZING MEDIUM.
Claim 2
Dependent Claim
76 words
THE IMPROVEMENT IN THE PROCESS OF PRODUCING A VAT DYE PIGMENT BY REACTING A LEUCO COMPOUND OF A VAT DYE WITH AN OXIDIZING AGENT WHICH COMPRISES DISPERSING AN AQUEOUS ALKALINE SOLUTION OF A LEUCO COMPOUND OF A VAT DYE INTO FINE DROPLETS, AND OXIDIZING THE LEUCO COMPOUND TO THE VAT DYE AND PRECIPITATING THE RESULTING VAT DYE IN FINELY DIVIDED FORM BY CONTACTING THE DROPLETS OF SOLUTION, WHILE IN DISPERSED FORM, WITH A LIQUID OXIDIZING MEDIUM.
References Cited (Backward Citations)
US2020387A
Cited
US2507944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-06 | 1963-01-05 | 1963-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-06 | 1967-01-05 | 1967-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-06 | 1971-01-05 | 1971-07-07 | $7700.00 | Window Closed / Lapsed |