US2852479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing an aqueous dispersion of melamine formaldehyde, pigment, and non-ionic surface active agent, product obtained and process of using
Assignee: Wyeth Holdings LLC
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Filing: 1953-08-28
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Granted: 1958-09-16
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Expires: 1973-08-28
Abstract
No abstract record available.
Inventors
- 👤 Bender Max
- 👤 Charles F Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:19
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725; Y10T428/31761; Y10T428/31768
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A STABLE DISPERSION OF A PIGMENT IN A COLLOIDAL AQUEOUS SOLUTION OF A PARTIALLY POLYMERIZED, POSITIVELY CHARGED MELAMINEFORMALDEHYDE CONDENSATION PRODUCT HAVING A GLASS ELECTRODE PH VALUE WITHIN THE RANGE OF ABOUT 0.5 TO ABOUT 3.5 WHEN MEASURED AT 15% SOLIDS, SAID CONDENSATION PRODUCT HAVING A DEGREE OF POLYMERIZATION LESS THAN THAT WHICH CHARACTERIZES GELS AND PRECIPITATES WHICH ARE UNDISPERSIBLE BY AGITATION WITH WATER BUT SUFFICIENT TO BRING THE PARTICLES THEREOF WITHIN THE COLLOIDAL RANGE, SAID CONDENSATION PRODUCT HAVING A DEFINITE POSITIVE ELECTRICAL CHARGE AS SHOWN BY ITS MIGRATION TOWARD THE CATHODE UPON ELECTROPHORESIS OF THE SOLUTION; AND CHARACTERIZED BY THE PRESENCE OF A NON-IONIC SURFACE ACTIVE AGENT.
Claim 2
Dependent Claim
107 words
A STABLE DISPERSION OF A PIGMENT IN A COLLOIDAL AQUEOUS SOLUTION OF A PARTIALLY POLYMERIZED, POSITIVELY CHARGED MELAMINEFORMALDEHYDE CONDENSATION PRODUCT HAVING A GLASS ELECTRODE PH VALUE WITHIN THE RANGE OF ABOUT 0.5 TO ABOUT 3.5 WHEN MEASURED AT 15% SOLIDS, SAID CONDENSATION PRODUCT HAVING A DEGREE OF POLYMERIZATION LESS THAN THAT WHICH CHARACTERIZES GELS AND PRECIPITATES WHICH ARE UNDISPERSIBLE BY AGITATION WITH WATER BUT SUFFICIENT TO BRING THE PARTICLES THEREOF WITHIN THE COLLOIDAL RANGE, SAID CONDENSATION PRODUCT HAVING A DEFINITE POSITIVE ELECTRICAL CHARGE AS SHOWN BY ITS MIGRATION TOWARD THE CATHODE UPON ELECTROPHORESIS OF THE SOLUTION; AND CHARACTERIZED BY THE PRESENCE OF A NON-IONIC SURFACE ACTIVE AGENT.
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) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |