Granted Patent
Utility
US 4,643,813 · App. 06/775,295
Process for producing alkanesulfonic acids
Inventors:
Yasukazu Sato, Kenichi Matsuda, Hiromi Ozaki, Teruo Suzuka, Mamoru Yamane
Patented Case
View Patent ↗
Granted: Feb 17, 1987
Filed: Sep 12, 1985
Inventors
Yasukazu Sato
Kenichi Matsuda
Hiromi Ozaki
Teruo Suzuka
Mamoru Yamane
Assignee (at issue)
Nippon Mining 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.