US3740341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of bis (alkoxyaminotriazinylamino)-stilbene - 2,2' - disulphonic acids
Assignee: Imperial Chemical Industries Ltd
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Filing: 1971-05-04
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Granted: 1973-06-19
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Expires: 1991-05-04
Abstract
Abstract OPTICAL BRIGHTENING AGENTS WHICH ARE THREE COMPONENT MIXTURES OBTAINED BY THE REACTION OF BIS(3-CHLORO-5ALKOXYTRIAZINYLAMINO)STILBENE-DISULPHONIC ACIDS WITH MIXTURES OF OPTIONALLY SUBSTITUTED MONO- OR DIALKYLAMINES AND OPTIONALLY SUBSTITUTED N-ALKYLARYLAMINES. THE AGENTS SEPARATE FROM THE HOT REACTION MIXTURES IN THE FORM OF MOBILE LIQUIDS.
Inventors
- 👤 P Brocklehurst
- 👤 E Hemingway
- 👤 M Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:16
CPC Classifications
D; D06; D06L; D06L4/00; D06L4/60; D06L4/65
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |