Granted Patent
Utility
US 4,564,709 · App. 06/545,392
Process for the production of dialkyl-trisulfides
Inventors:
Yuichiro Koyama, Hiroshi Nakazawa, Toshiaki Yamashita, Hitoshi Moriyama
Patented Case
View Patent ↗
Granted: Jan 14, 1986
Filed: Oct 7, 1983
Inventors
Yuichiro Koyama
Hiroshi Nakazawa
Toshiaki Yamashita
Hitoshi Moriyama
Assignee (at issue)
Pennwalt Corporation
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.