US3723490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of azomethine pigments
Assignee: Novartis AG
•
Filing: 1970-05-20
•
Granted: 1973-03-27
•
Expires: 1990-05-20
Abstract
Abstract Copper complexes of substituted bis-2-hydroxyphenyl-azomethines are prepared by reacting the products of salicylaldehydes and oaminophenols with a coppering agent. Said compounds are pigments for organic material.
Inventors
- 👤 E Inman
- 👤 I Macpherson
- 👤 J Stirling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:59
CPC Classifications
C; C09; C09B; C09B55/00; C09B55/002; C07; C07F; C07F1/00; C07F1/005
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
14 words
A process for producing a pigment comprising finely dividing a compound of the formula
Claim 2
Dependent Claim
20 words
A process as claimed in claim 2 wherein the compound is produced by reacting an ortho-hydroxy aldehyde of the formula
Claim 3
Dependent Claim
34 words
A process as claimed in claim 2 wherein the fine division is effected in a horizontally rotating gravity mixer, a grinder operated by a vertically rotating shaft or a grinder operated by vibratory action.
References Cited (Backward Citations)
US2116913A
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US2239290A
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US2282936A
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US2442200A
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US2381952A
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US3440254A
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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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |