Granted Patent
Utility
US 5,143,644 · App. 07/505,592
Carboxylic acid ester compounds, and their related matters and method of producing the same
Inventors:
Hideo Yamaoka, Toyoji Shimizu, Fujihisa Matsunaga, Shinichi Nishiyama, Toru Yamanaka, Shoichi Miyakoshi
Patented Case
View Patent ↗
Granted: Sep 1, 1992
Filed: Apr 6, 1990
Inventors
Hideo Yamaoka
Toyoji Shimizu
Fujihisa Matsunaga
Shinichi Nishiyama
Toru Yamanaka
Shoichi Miyakoshi
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.