US2618529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Application of leuco esters of vat dyestuffs on animal fibers using urea and an acid
Assignee: General Dyestuff Corp
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Filing: 1949-12-31
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Granted: 1952-11-18
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Expires: 1969-12-31
Abstract
No abstract record available.
Inventors
- 👤 Luttringhaus Hans
- 👤 James E Flint
- 👤 Alex A Arcus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:10
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/22; D06P1/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
AN AQUEOUS DYE COMPOSITION FOR PRINTING OR PADDING ANIMAL FIBER, CONTAINING IN AQUEOUS SOLUTION, UP TO 20% OF A SULFURIC ESTER SALT OF A LEUCO VAT DYESTUFF, ABOUT 10% OF UREA, AND A FREE ACID IN A CONCENTRATION FROM 0.3 TO 5%, WHICH YIELDS A PH OF 1 TO 3 IN WATER, SAID COMPOSITION CONTAINING NO SUBSTANTIAL AMOUNTS OF OTHER STRONG ELECTROLYES.
Claim 2
Dependent Claim
62 words
AN AQUEOUS DYE COMPOSITION FOR PRINTING OR PADDING ANIMAL FIBER, CONTAINING IN AQUEOUS SOLUTION, UP TO 20% OF A SULFURIC ESTER SALT OF A LEUCO VAT DYESTUFF, ABOUT 10% OF UREA, AND A FREE ACID IN A CONCENTRATION FROM 0.3 TO 5%, WHICH YIELDS A PH OF 1 TO 3 IN WATER, SAID COMPOSITION CONTAINING NO SUBSTANTIAL AMOUNTS OF OTHER STRONG ELECTROLYES.
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) | 1955-11-18 | 1956-05-19 | 1956-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-18 | 1960-05-19 | 1960-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-18 | 1964-05-19 | 1964-11-18 | $7700.00 | Window Closed / Lapsed |