US2973239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color fixing agents
Assignee: United Merchants and Manuf Inc
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Filing: 1956-11-19
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Granted: 1961-02-28
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Expires: 1976-11-19
Abstract
No abstract record available.
Inventors
- 👤 Alexander F Gortvai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:10
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/655; D06P1/66; D06P1/52; D06P1/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A PROCESS FOR THE PRODUCTION OF WATER SOLUBLE CONDENSATION PRODUCTS WHICH INCLUDES THE STEPS OF REACTING ABOUT 1 MOLE OF DICYANDIAMIDE AND FROM ABOUT 1 MOLE TO ABOUT 5 MOLES OF FORMALDEHYDE IN ALKALINE AQUEOUS SOLUTION BY HEATING SAID SOLUTION TO A TEMPERATURE OF FROM 60*C. TO 75*C. AND MAINTAINING THE TEMPERATURE AT THAT LEVEL UNTIL THE REACTION IS COMPLETE, ADJUSTING THE PH OF THE SOLUTION TO 7.2, AND THEREAFTER REACTING THE PRECONDENSATE SO FORMED WITH FROM ABOUT 1/20 MOLE TO ABOUT 1/2 MOLE OF DIETHYL SULFATE BY ADDING THE DIETHYL SULFATE TO THE PRECONDENSATE AND ALLOWING THE TEMPERATURE OF THE MIXTURE THUS FORMED TO REACH A LEVEL OF FROM 85* C. TO 95*C. AND KEEPING THE TEMPERATURE WITHIN THESE LIMITS UNTIL THE SECOND REACTION IS COMPLETE AS EVIDENCED BY CESSATION OF GAS EVOLUTION.
Claim 2
Dependent Claim
134 words
A PROCESS FOR THE PRODUCTION OF WATER SOLUBLE CONDENSATION PRODUCTS WHICH INCLUDES THE STEPS OF REACTING ABOUT 1 MOLE OF DICYANDIAMIDE AND FROM ABOUT 1 MOLE TO ABOUT 5 MOLES OF FORMALDEHYDE IN ALKALINE AQUEOUS SOLUTION BY HEATING SAID SOLUTION TO A TEMPERATURE OF FROM 60*C. TO 75*C. AND MAINTAINING THE TEMPERATURE AT THAT LEVEL UNTIL THE REACTION IS COMPLETE, ADJUSTING THE PH OF THE SOLUTION TO 7.2, AND THEREAFTER REACTING THE PRECONDENSATE SO FORMED WITH FROM ABOUT 1/20 MOLE TO ABOUT 1/2 MOLE OF DIETHYL SULFATE BY ADDING THE DIETHYL SULFATE TO THE PRECONDENSATE AND ALLOWING THE TEMPERATURE OF THE MIXTURE THUS FORMED TO REACH A LEVEL OF FROM 85* C. TO 95*C. AND KEEPING THE TEMPERATURE WITHIN THESE LIMITS UNTIL THE SECOND REACTION IS COMPLETE AS EVIDENCED BY CESSATION OF GAS EVOLUTION.
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) | 1964-02-28 | 1964-08-29 | 1965-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-28 | 1968-08-29 | 1969-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-28 | 1972-08-29 | 1973-02-28 | $7700.00 | Window Closed / Lapsed |