US2668804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pigments and molding powders comprising polyvinyl acetal resins dyed with azo dyes
Assignee: Calico Printers Association Ltd
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Filing: 1948-09-20
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Granted: 1954-02-09
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Expires: 1968-09-20
Abstract
No abstract record available.
Inventors
- 👤 Lantz Louis Amedee
- 👤 Spinner Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:18
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/006; C09B67/0061
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A METHOD FOR THE PREPARATION OF PIGMENTS AND MOULDING POWDERS, COMPRISING DYEING A FINELY-DIVIDED WATER-SOLUBLE AROMATIC POLYVINYL ACETAL CONTAINING ACETAL GROUPS DERIVED FROM AT LEAST ONE ALDEHYDE OF THE BENZENE AND NAPHTHALENE SERIES FREE FROM WATER-SOLUBILIZING GROUPS, BY MIXING IT WITH AN AQUEOUS SOLUTION OF AN ALKALI METAL SALT OF COUPLING COMPONENT POSSESSING THE GROUPING.
Claim 2
Independent Claim
55 words
A METHOD FOR THE PREPARATION OF PIGMENTS AND MOULDING POWDERS, COMPRISING DYEING A FINELY-DIVIDED WATER-SOLUBLE AROMATIC POLYVINYL ACETAL CONTAINING ACETAL GROUPS DERIVED FROM AT LEAST ONE ALDEHYDE OF THE BENZENE AND NAPHTHALENE SERIES FREE FROM WATER-SOLUBILIZING GROUPS, BY MIXING IT WITH AN AQUEOUS SOLUTION OF AN ALKALI METAL SALT OF COUPLING COMPONENT POSSESSING THE GROUPING.
References Cited (Backward Citations)
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Cited
US2310943A
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-08 | 1957-08-10 | 1958-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-08 | 1961-08-10 | 1962-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-08 | 1965-08-10 | 1966-02-09 | $7700.00 | Window Closed / Lapsed |