Granted Patent
Utility
US 5,254,766 · App. 07/773,264
Process for producing alkyl-substituted aromatic hydrocarbon using heteropolyacid salts
Inventors:
Terunori Fujita, Kazunori Takahata, Hiroyasu Ohno, Masayasu Ishibashi, Hideo Oikawa
Patented Case
View Patent ↗
Granted: Oct 19, 1993
Filed: Oct 9, 1991
Inventors
Terunori Fujita
Kazunori Takahata
Hiroyasu Ohno
Masayasu Ishibashi
Hideo Oikawa
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.