2-[4-[4-(2-Pyrimidinyl)-1-piperazinyl]alkyl]alkyl]pyrido- and pyrazino-indole-1,3-dione derivatives as histamine H.sub.1 antagonists

Granted: May 31, 1988 Filed: Oct 21, 1986

This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.