Granted Patent
Utility
US 5,009,971 · App. 07/391,067
Gas recombinant separator
Inventors:
Harlan B. Johnson, Samuel B. Laferty, Melvin P. Wagner, Shantilal M. Mohnot
Patented Case
View Patent ↗
Granted: Apr 23, 1991
Filed: Aug 9, 1989
Inventors
Harlan B. Johnson
Samuel B. Laferty
Melvin P. Wagner
Shantilal M. Mohnot
Assignee (at issue)
PPG Industries, 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.