Granted Patent
Utility
US 5,004,849 · App. 07/451,303
Manufacture of perchloroethylene and trichloroethylene by catalytic oxychlorination, and improved catalysts therefor
Inventors:
Robert P. Hirschmann, William Q. Beard, Jr., Eric L. Mainz, Earl B. Smith, Barry M. Little
Patented Case
View Patent ↗
Granted: Apr 2, 1991
Filed: Dec 15, 1989
Inventors
Robert P. Hirschmann
William Q. Beard, Jr.
Eric L. Mainz
Earl B. Smith
Barry M. Little
Assignee (at issue)
Vulcan Chemicals
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.