Granted Patent
Utility
US 4,547,585 · App. 06/381,874
Process for preparing tetrakis [3-(3,5-dibutyl-4-hydroxyphenyl)propionyloxymethyl] methane
Inventors:
Toru Yamanaka, Tadatoshi Yoshimura
Patented Case
View Patent ↗
Granted: Oct 15, 1985
Filed: May 25, 1982
Inventors
Toru Yamanaka
Tadatoshi Yoshimura
Assignee (at issue)
Mitsui Petrochemical 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.