US2437554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyestuff preparations containing an acid ester salt of a leuco vat dyestuff, a water-soluble acid amide and a salt of a quaternary amino acid
Assignee: Durand and Huguenin AG
•
Filing: 1943-11-29
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Granted: 1948-03-09
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Expires: 1963-11-29
Abstract
No abstract record available.
Inventors
- 👤 Ratti Roger
- 👤 Brandt Philipp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:43
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/22; D06P1/28; D06P1/44; D06P1/655
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-09 | 1951-09-08 | 1952-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-09 | 1955-09-08 | 1956-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-09 | 1959-09-08 | 1960-03-09 | $7700.00 | Window Closed / Lapsed |