Granted Patent
Utility
US 5,326,739 · App. 08/134,719
Process for producing 3,5-di(.alpha.-methylbenzyl)salicylic 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: Jul 5, 1994
Filed: Oct 12, 1993
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.