Granted Patent
Utility
US 5,223,641 · App. 07/915,386
Carboxylic acid mixtures and process for producing the same
Inventors:
Hiroshi Kawasaki, Hideaki Miwa, Osamu Ichihara
Patented Case
View Patent ↗
Granted: Jun 29, 1993
Filed: Jul 20, 1992
Inventors
Hiroshi Kawasaki
Hideaki Miwa
Osamu Ichihara
Assignee (at issue)
Idemitsu Petrochemical Chemical Company, Limited
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.