US2540799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyestuff compositions comprising esterified vat dyes and basic pyrazolones
Assignee: GAF Chemicals Corp
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Filing: 1948-05-27
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Granted: 1951-02-06
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Expires: 1968-05-27
Abstract
No abstract record available.
Inventors
- 👤 Taras John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:14
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/64; D06P1/642; D06P1/6426; D06P1/22; D06P1/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
A DYESTUFF COMPOSITION COMPRISING A SALT OF AN ACID POLYBASIC ACID ESTER OF A LEUCO VAT DYESTUFF, AND A BASIC PYRAZOLONE COMPOUND.
Claim 2
Dependent Claim
22 words
A DYESTUFF COMPOSITION COMPRISING A SALT OF AN ACID POLYBASIC ACID ESTER OF A LEUCO VAT DYESTUFF, AND A BASIC PYRAZOLONE COMPOUND.
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) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |