Patent US2525835A successfully refreshed from Google Patents.
US2525835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of coated pigment particles
Assignee: Individual
•
Filing: 1947-08-26
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Granted: 1950-10-17
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Expires: 1967-08-26
Abstract
No abstract record available.
Inventors
- 👤 Alfred F Schmutzler
- 👤 Donald F Othmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:54
CPC Classifications
C; C09; C09C; C09C3/00; C09C3/003; C01; C01P; C01P2004/00; C01P2004/80; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
THE PROCESS OF COATING AN ACID STABLE PIGMENT WITH AN ORGANIC WATER-IMMISCIBLE FILM FORMING MATERIAL COMPRISING HOLDING PIGMENT PARTICLES IN AN AQUEOUS ACID SUSPENSION CONTAINING NO EMULSIFYING AGENTS, MIXING WITH SAID SUSPENSION A MINOR AMOUNT OF THE WATER-IMMISCIBLE FILM FORMING MATERIAL IN THE FORM OF EXTREMELY FINELY DIVIDED PARTICLES WHEREBY SAID PIGMENT PARTICLES ARE COATED WITH SAID WATER-IMMISCIBLE MATERIAL, MAINTAINING THE PH OF THE MIXTURE OF THE SUSPENSION AND THE WATER-IMMISCIBLE LIQUID ALWAYS BELOW 7 DURING THE COATING PROCESS, THE ACIDITY OF SAID MIXTURE SERVING TO AVOID ANY COLLOIDAL CHARACTERISTICS OF SAID WATERIMMISCIBLE MATERIAL AFTER MIXTURE IN SAID ACID AQUEOUS SUSPENSION, WHEREBY THE FINISHED COATED PIGMENT PARTICLES ARE FREE OF CONTAMINATION BY EMULSIFYING AGENTS.
Claim 2
Dependent Claim
114 words
THE PROCESS OF COATING AN ACID STABLE PIGMENT WITH AN ORGANIC WATER-IMMISCIBLE FILM FORMING MATERIAL COMPRISING HOLDING PIGMENT PARTICLES IN AN AQUEOUS ACID SUSPENSION CONTAINING NO EMULSIFYING AGENTS, MIXING WITH SAID SUSPENSION A MINOR AMOUNT OF THE WATER-IMMISCIBLE FILM FORMING MATERIAL IN THE FORM OF EXTREMELY FINELY DIVIDED PARTICLES WHEREBY SAID PIGMENT PARTICLES ARE COATED WITH SAID WATER-IMMISCIBLE MATERIAL, MAINTAINING THE PH OF THE MIXTURE OF THE SUSPENSION AND THE WATER-IMMISCIBLE LIQUID ALWAYS BELOW 7 DURING THE COATING PROCESS, THE ACIDITY OF SAID MIXTURE SERVING TO AVOID ANY COLLOIDAL CHARACTERISTICS OF SAID WATERIMMISCIBLE MATERIAL AFTER MIXTURE IN SAID ACID AQUEOUS SUSPENSION, WHEREBY THE FINISHED COATED PIGMENT PARTICLES ARE FREE OF CONTAMINATION BY EMULSIFYING AGENTS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-16 | 1954-04-17 | 1954-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-16 | 1958-04-17 | 1958-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-16 | 1962-04-17 | 1962-10-17 | $7700.00 | Window Closed / Lapsed |