US2506580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of sulfuric esters of leuco vat dyestuffs
Assignee: Imperial Chemical Industries Ltd
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Filing: 1947-03-25
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Granted: 1950-05-09
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Expires: 1967-03-25
Abstract
No abstract record available.
Inventors
- 👤 Coffey Samuel
- 👤 Driver George William
- 👤 Fairweather David Alexan Whyte
- 👤 Irving Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:45
CPC Classifications
C; C09; C09B; C09B9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A PROCESS FOR THE MANUFACTURE OF LEUCO SULPHURIC ESTER DERIVATIVES OF VAT DYESTUFF AND VAT DYESTUFF INTERMEDIATE COMPOUNDS WHICH COMPRISES TREATING THE OXIDIZED FORM OF THE VAT COMPOUND, IN THE PRESENCE OF A NON-VATTABLE ORGANIC AMIDE OF A CARBOXYLIC ACID IN WHICH THE HYDROGEN ATOMS ATTACHED TO THE AMIDE NITROGEN ATOM HAVE BEEN REPLACED BY HYDROCARBON RADICLES AND A METAL SELECTED FROM THE GROUP CONSISTING OF IRON, NICKEL, COPPER AND BRASS, WITH A SULPHUR COMPOUND WHICH WILL GIVE RISE TO SULFUR TRIOXIDE IN THE MIXTURE AND RECOVERING THE LEUCO SULPHURIC ESTER DERIVATIVE OF THE COMPOUND FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
99 words
A PROCESS FOR THE MANUFACTURE OF LEUCO SULPHURIC ESTER DERIVATIVES OF VAT DYESTUFF AND VAT DYESTUFF INTERMEDIATE COMPOUNDS WHICH COMPRISES TREATING THE OXIDIZED FORM OF THE VAT COMPOUND, IN THE PRESENCE OF A NON-VATTABLE ORGANIC AMIDE OF A CARBOXYLIC ACID IN WHICH THE HYDROGEN ATOMS ATTACHED TO THE AMIDE NITROGEN ATOM HAVE BEEN REPLACED BY HYDROCARBON RADICLES AND A METAL SELECTED FROM THE GROUP CONSISTING OF IRON, NICKEL, COPPER AND BRASS, WITH A SULPHUR COMPOUND WHICH WILL GIVE RISE TO SULFUR TRIOXIDE IN THE MIXTURE AND RECOVERING THE LEUCO SULPHURIC ESTER DERIVATIVE OF THE COMPOUND FROM THE REACTION MIXTURE.
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) | 1953-05-08 | 1953-11-07 | 1954-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-08 | 1957-11-07 | 1958-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-08 | 1961-11-07 | 1962-05-09 | $7700.00 | Window Closed / Lapsed |