Granted Patent
Utility
US 5,274,150 · App. 07/740,386
Process for producing 3,5-di(.alpha.-methylbenzyl)salicyclic acid derivative, and use of polyvalent-metal-modified product thereof as color developer
Inventors:
Yoshimitsu Tanabe, Keizaburo Yamaguchi, Akihiro Yamaguchi
Patented Case
View Patent ↗
Granted: Dec 28, 1993
Filed: Aug 5, 1991
Inventors
Yoshimitsu Tanabe
Keizaburo Yamaguchi
Akihiro Yamaguchi
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.