Granted Patent
Utility
US 4,520,203 · App. 06/523,987
Resolution of (.+-.)-1,8-diethyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetic acid using cinchonine
Inventors:
Nedumparambil A. Abraham, Christopher A. Demerson
Patented Case
View Patent ↗
Granted: May 28, 1985
Filed: Aug 16, 1983
Inventors
Nedumparambil A. Abraham
Christopher A. Demerson
Assignee (at issue)
Amerimas Home Products, Inc.
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.