Granted Patent
Utility
US 3,932,309 · App. 05/476,505
Auto exhaust catalysts prepared from sulfite treated platinum and palladium salt solutions
Inventors:
James Graham, Michael V. Ernest, James M. Maselli
Patented Case
View Patent ↗
Granted: Jan 13, 1976
Filed: Jun 5, 1974
Inventors
James Graham
Michael V. Ernest
James M. Maselli
Assignee (at issue)
W. R. Grace & Co.
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.