Granted Patent
Utility
US 5,089,655 · App. 07/403,492
Individual .alpha.-form particle crystals of tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionyloxymethyl]methane and process for its production
Inventors:
Takanori Miura, Masanori Kohara, Kunihide Oka
Patented Case
View Patent ↗
Granted: Feb 18, 1992
Filed: Sep 6, 1989
Inventors
Takanori Miura
Masanori Kohara
Kunihide Oka
Assignee (at issue)
Yoshitomi Pharmaceutical Industries, Ltd.
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.