US2654713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulverizable and readily soluble brightening agents
Assignee: Sandoz AG
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Filing: 1952-11-18
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Granted: 1953-10-06
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Expires: 1972-11-18
Abstract
No abstract record available.
Inventors
- 👤 Fleck Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:34
CPC Classifications
D; D06; D06L; D06L4/00; D06L4/60; D06L4/664; Y; Y10; Y10S; Y10S8/00; Y10S8/916; Y10S8/917
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
53 words
A PULVERIZABLE AND READILY WATER-SOLUBLE BRIGHTENING AGENT, CONSISTING ESSENTIALLY OF A MIXTURE OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF 4-METHYL-7-DIETHYLAMINO-COUMARIN AND SALTS THEREOF WITH A WATER-SOLUBLE ACID WITH SEVERAL-FOLD THE QUANTITY BY WEIGHT, RELATIVE TO THE WEIGHT OF THE 4-METHYL-7-DIETHYLAMINO-COUMARIN, OF A WATER-SOLUBLE SOLID ACID SALT OF A STRONG INORGANIC ACID.
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) | 1956-10-05 | 1957-04-06 | 1957-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-05 | 1961-04-06 | 1961-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-05 | 1965-04-06 | 1965-10-06 | $7700.00 | Window Closed / Lapsed |