US2507944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of sulfuric esters of leuco vat dyes
Assignee: GAF Chemicals Corp
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Filing: 1947-04-29
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Granted: 1950-05-16
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Expires: 1967-04-29
Abstract
No abstract record available.
Inventors
- 👤 Taras John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:10
CPC Classifications
C; C09; C09B; C09B9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A PROCESS FOR THE PRODUCTION OF WATERSOLUBLE SULFURIC ESTER SALTS OF LEUCO VAT DYES BY REACTING A LEUCO VAT DYE WITH THE SULFUR TRIOXIDE ADDITION COMPOUND OF A TERTIARY AMINE SELECTED FROM THE CLASS CONSISTING OF PYRIDINE AND APICOLINE WHICH CONSISTS IN ADDING SAID ADDITION COMPOUND IN THE FORM OF A PREFORMED SOLID TO A SOLUTION CONSISTING OF AN AQUEOUS ALKALINE SOLUTION OF SAID LEUCO COMPOUND IN WHICH THE ALKALI IS A STRONG INORGANIC ALKALI WHILE EMPLOYING FOR EACH MOLECULE OF THE LEUCO VAT DYE FROM 10 TO ABOUT 40 MOLS OF ALKALI AND AT LEAST 3 MOLS OF SAID SULFUR TRIOXIDE ADDITION COMPOUND AND AGITATING THE SOLUTION AT A TEMPERATURE RANGING FROM ABOUT 20 TO ABOUT 50*C.
Claim 2
Dependent Claim
118 words
A PROCESS FOR THE PRODUCTION OF WATERSOLUBLE SULFURIC ESTER SALTS OF LEUCO VAT DYES BY REACTING A LEUCO VAT DYE WITH THE SULFUR TRIOXIDE ADDITION COMPOUND OF A TERTIARY AMINE SELECTED FROM THE CLASS CONSISTING OF PYRIDINE AND APICOLINE WHICH CONSISTS IN ADDING SAID ADDITION COMPOUND IN THE FORM OF A PREFORMED SOLID TO A SOLUTION CONSISTING OF AN AQUEOUS ALKALINE SOLUTION OF SAID LEUCO COMPOUND IN WHICH THE ALKALI IS A STRONG INORGANIC ALKALI WHILE EMPLOYING FOR EACH MOLECULE OF THE LEUCO VAT DYE FROM 10 TO ABOUT 40 MOLS OF ALKALI AND AT LEAST 3 MOLS OF SAID SULFUR TRIOXIDE ADDITION COMPOUND AND AGITATING THE SOLUTION AT A TEMPERATURE RANGING FROM ABOUT 20 TO ABOUT 50*C.
References Cited (Backward Citations)
GB271533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-15 | 1953-11-14 | 1954-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-15 | 1957-11-14 | 1958-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-15 | 1961-11-14 | 1962-05-16 | $7700.00 | Window Closed / Lapsed |