Granted Patent
Utility
US 4,773,974 · App. 06/924,572
Production of hexavalent chromium for use in chlorate cells
Inventor:
Leszek M. Dobosz
Patented Case
View Patent ↗
Granted: Sep 27, 1988
Filed: Oct 29, 1986
Inventor
Leszek M. Dobosz
Assignee (at issue)
Tenneco Canada Inc.
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.