Granted Patent
Utility
US 4,570,656 · App. 06/491,821
Method of transporting viscous hydrocarbons
Inventors:
William J. Matlach, Michael Newberry, Charles L. Thierheimer, Jr.
Patented Case
View Patent ↗
Granted: Feb 18, 1986
Filed: May 5, 1983
Inventors
William J. Matlach
Michael Newberry
Charles L. Thierheimer, Jr.
Assignee (at issue)
Petrolite Corporation
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.