Phosphodiesterase 4 inhibitors

Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Having -c- – wherein x is chalcogen – bonded directly to...

Reexamination Certificate

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C514S252100, C514S357000, C514S367000, C514S374000, C514S438000, C514S471000, C544S409000, C546S268400, C546S337000, C548S179000, C548S237000, C549S075000, C549S451000

Reexamination Certificate

active

10754600

ABSTRACT:
PDE4 inhibition is achieved by novel compounds, e.g., N-substituted aniline and diphenylamine analogs. The compounds of the present invention are of Formula I:wherein R1, R2, R3and R4are as defined herein.

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