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US2998411A Expired / Lapsed US ⏱️ 0.0 years remaining

Melamine-formaldehyde reaction products and process of preparing the same

Assignee: Wyeth Holdings LLC
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Filing: 1958-03-17
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Granted: 1961-08-29
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Expires: 1978-03-17
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Abstract

No abstract record available.

Inventors

  • 👤 Richard N Housekeeper

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-06 14:32
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/40; C08G12/42; C08G12/424; C08G12/425; C08G12/427

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 137 words
A PROCESS COMPRISING DISSOLVING MELAMINE IN A SUBSTANTIALLY NON-ACHOHOLIC AQUEOUS SOLUTION OF MELAMINE, AT A MOL RATIO OF AT LEAST 6.5:1 FORMALDEHYDE TO MELADEHYDE RESPECTIVELY, AT A PH BETWEEN 7 AND 11 AND CORRESPONDINGLY AT A TEMPERATURE BETWEEN ABOUT 75*C. AND 35*C. WITH CONSISTANT STIRRING UNTIL THE SOLUTION CLEARS, WHILE ADJUSTING THE WATER CONTENT TO A MINIMUM OF 60% BY WEIGHT OF THE TOTAL CHANGE MAINTAINING THE PH BETWEEN 7 AND 11 AND CORRESPONDINGLY MAINTAINING THE TEMPERATURE BETWEEN 75*C. AND 35*C. WHILE STIRRING THE REACTION MIXTURE, WHILE THE REACTION CONTINUES, WITH MOVEMENT THROUGH THE REACTION MEDIUM IN AN OTHERWISE UNAGITATED DISPERSION, RAISING THE PH TO BETWEEN 8 AND 11 UOPN EXOTHERM SUBSIDENCE, IN ORDER TO INHABIT TEMPERATURE DECLINE, UNTIL THE REACTION PRODUCT HAS SUBSTANTIALLY COMPLETLY PRECUPITATED OUT OF SOLUTION AND SEPARATING THE SILIDS FROM THE SUPERNATANT LIQUID.
Claim 2
Dependent Claim 137 words
A PROCESS COMPRISING DISSOLVING MELAMINE IN A SUBSTANTIALLY NON-ACHOHOLIC AQUEOUS SOLUTION OF MELAMINE, AT A MOL RATIO OF AT LEAST 6.5:1 FORMALDEHYDE TO MELADEHYDE RESPECTIVELY, AT A PH BETWEEN 7 AND 11 AND CORRESPONDINGLY AT A TEMPERATURE BETWEEN ABOUT 75*C. AND 35*C. WITH CONSISTANT STIRRING UNTIL THE SOLUTION CLEARS, WHILE ADJUSTING THE WATER CONTENT TO A MINIMUM OF 60% BY WEIGHT OF THE TOTAL CHANGE MAINTAINING THE PH BETWEEN 7 AND 11 AND CORRESPONDINGLY MAINTAINING THE TEMPERATURE BETWEEN 75*C. AND 35*C. WHILE STIRRING THE REACTION MIXTURE, WHILE THE REACTION CONTINUES, WITH MOVEMENT THROUGH THE REACTION MEDIUM IN AN OTHERWISE UNAGITATED DISPERSION, RAISING THE PH TO BETWEEN 8 AND 11 UOPN EXOTHERM SUBSIDENCE, IN ORDER TO INHABIT TEMPERATURE DECLINE, UNTIL THE REACTION PRODUCT HAS SUBSTANTIALLY COMPLETLY PRECUPITATED OUT OF SOLUTION AND SEPARATING THE SILIDS FROM THE SUPERNATANT LIQUID.

References Cited (Backward Citations)

US2197357A Cited
US2529856A Cited
US2684347A Cited
US2645625A Cited
US2781332A Cited
US2918452A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1964-08-28 1965-02-27 1965-08-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1968-08-28 1969-02-27 1969-08-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1972-08-28 1973-02-27 1973-08-29 $7700.00 Window Closed / Lapsed

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