Granted Patent
Utility
US 4,405,807 · App. 06/224,831
Tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionyloxymethyl]methane having a novel crystal structure and process for production thereof
Inventors:
Hiroshi Hasui, Toshikazu Furihata, Kazuko Takanashi, Masahiko Ohmori
Patented Case
View Patent ↗
Granted: Sep 20, 1983
Filed: Jan 13, 1981
Inventors
Hiroshi Hasui
Toshikazu Furihata
Kazuko Takanashi
Masahiko Ohmori
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.