US2534136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pigments and molding powders comprising polyvinyl acetal resins dyed with vat dyes
Assignee: Calico Printers Association Ltd
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Filing: 1948-03-30
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Granted: 1950-12-12
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Expires: 1968-03-30
Abstract
No abstract record available.
Inventors
- 👤 Lantz Louis Amedee
- 👤 Schofield Arthur
- 👤 Spinner Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:25
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/22; C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0041; C08K5/16; C08K5/22; C08K5/23; C09; C09B; C09B39/00; C09B67/00; C09B67/006; C09B67/0061; C09B69/00; C09B69/10; C09B69/106
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
IN THE MANUFACTUR OF PIGMENTS AND COLORED MOLDING POWDERS, THE PROCESS WHICH COMPRISES DYEING A FINELY-DIVIDED, PARTIAL POLYVINYL ACETAL OF AN AROMATIC ALDEHYDE, SELECTED FROM THE GROUP CONSISTING OF ALDEHYDES OF THE BENZENE AND NAPHTHALENE SERIES, AND HAVING A RATIO OF HYDROXYL GROUPS TO ACETAL AND ESTER GROUPS RANGING FROM ABOUT 40:60 TO 60:40; A SUFFICIENT NUMBER OF AROMATIC ACETAL GRUPS BEING PRESENT TO RENDER SAID PARTIAL POLYVINYL ACETAL INSOLUBLE IN WATER; BY MIXING WITH SAID ACETAL ALEUCO-DERIVATIVE OF A VAT DYESTUFF IN AN AQUEOUS ALKALINE MEDIUM CONTAINING A REDUCING AGENT AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 50* TO 100*C., WASHING THE DYED ACETAL TO REMOVE UNFIXED LEUCO-DERIVATIVES, OXIDIZING THE FIXED LEUCO-DERIVATIVE IN AN ACID MEDIUM TO REGENATE THE ORIGNAL DYESTUFF AND RECOVERING THE RESULTING DYED PRODUCT;THE SAID PARTIAL POLYVINYL ACETAL HAVING AN AVERAGE PARTICLE SIZE NOT SUBSTANTIALLY EXCEEDING 3.5 MICRONS.
Claim 2
Dependent Claim
143 words
IN THE MANUFACTUR OF PIGMENTS AND COLORED MOLDING POWDERS, THE PROCESS WHICH COMPRISES DYEING A FINELY-DIVIDED, PARTIAL POLYVINYL ACETAL OF AN AROMATIC ALDEHYDE, SELECTED FROM THE GROUP CONSISTING OF ALDEHYDES OF THE BENZENE AND NAPHTHALENE SERIES, AND HAVING A RATIO OF HYDROXYL GROUPS TO ACETAL AND ESTER GROUPS RANGING FROM ABOUT 40:60 TO 60:40; A SUFFICIENT NUMBER OF AROMATIC ACETAL GRUPS BEING PRESENT TO RENDER SAID PARTIAL POLYVINYL ACETAL INSOLUBLE IN WATER; BY MIXING WITH SAID ACETAL ALEUCO-DERIVATIVE OF A VAT DYESTUFF IN AN AQUEOUS ALKALINE MEDIUM CONTAINING A REDUCING AGENT AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 50* TO 100*C., WASHING THE DYED ACETAL TO REMOVE UNFIXED LEUCO-DERIVATIVES, OXIDIZING THE FIXED LEUCO-DERIVATIVE IN AN ACID MEDIUM TO REGENATE THE ORIGNAL DYESTUFF AND RECOVERING THE RESULTING DYED PRODUCT;THE SAID PARTIAL POLYVINYL ACETAL HAVING AN AVERAGE PARTICLE SIZE NOT SUBSTANTIALLY EXCEEDING 3.5 MICRONS.
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) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |