US3940410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bis-benzonazoledicarbonitriles
Assignee: Sandoz AG
•
Filing: 1974-09-05
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Granted: 1976-02-24
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Expires: 1994-09-05
Abstract
Abstract Disclosed are compounds of formula I ##SPC1## in which n signifies 2 or 3, Their production and use as optical brighteners, particularly for polymeric and textile substrates.
Inventors
- 👤 Hans Kittl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:57
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/52; C07D263/62; C07D263/64; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/35
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
13 words
A compound of formula I, ##SPC11## in which n signifies 2 or 3.
Claim 2
Dependent Claim
13 words
A compound of formula I, ##SPC11## in which n signifies 2 or 3.
Claim 3
Dependent Claim
10 words
A compound of claim 1, in which n is 2.
Claim 4
Dependent Claim
10 words
A compound of claim 1, in which n is 3.
References Cited (Backward Citations)
US3798231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |