US3867376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bis-s-triazinyl-amino-stilbene-2,2{40 -disulphonic acids
Assignee: Novartis AG
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Filing: 1972-06-27
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Granted: 1975-02-18
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Expires: 1992-06-27
Abstract
Abstract The present invention provides 4,4''-bis-(4,6-di-(2-sulpho)anilino-1,3,5-triazinyl-(2)-amino)-stilbene-2,2'' -disulphonic acids, which are useful fluorescent whitening agents, especially in the surface coating treatment of paper.
Inventors
- 👤 Franz Guenter
- 👤 Werner Fringeli
- 👤 Peter Liechti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:09
CPC Classifications
D; D06; D06L; D06L4/00; D06L4/60; C; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/40; C07D251/54; C07D251/68; C07D401/00; C07D401/14; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/07; D21H17/09; D21H21/00; D21H21/14; D21H21/30; Y; Y02; Y02B; Y02B30/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
References Cited (Backward Citations)
US2945762A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |