Optical: systems and elements – Lens
Reexamination Certificate
2007-10-02
2007-10-02
Woodward, Ana (Department: 1711)
Optical: systems and elements
Lens
C525S125000, C525S176000, C525S196000, C525S198000, C525S201000, C525S202000, C525S204000
Reexamination Certificate
active
10815880
ABSTRACT:
Disclosed herein is a method for producing a 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine. The method comprises forming a reaction mixture comprising at least one substituted or unsubstituted phenolphthalein, at least one substituted or unsubstituted primary hydrocarbyl amine, and an acid catalyst; and heating the reaction mixture to a temperature of less than 180° C. to remove a distillate comprising water and form a crude 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine product; where the 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine has a formula:where R1is selected from the group consisting of a hydrogen and a hydrocarbyl group, and R2is selected from the group consisting of a hydrogen, a hydrocarbyl group, and a halogen.
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Chatterjee Gautam
Dhanabalan Anantharaman
Rai Vinod Kumar
Shanmugam Suresh
Srinivasan Veeraraghavan
General Electric Company
Woodward Ana
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