Granted Patent
Utility
US 4,026,821 · App. 05/684,559
Catalyst regeneration
Inventors:
Richard J. Schoofs, Lloyd J. Nordhausen, Lee A. Dugdale
Patented Case
View Patent ↗
Granted: May 31, 1977
Filed: May 10, 1976
Inventors
Richard J. Schoofs
Lloyd J. Nordhausen
Lee A. Dugdale
Assignee (at issue)
Catco Venture
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.