Granted Patent
Utility
US 4,461,674 · App. 06/421,382
Apparatus for recovery of different weight fractions of oil from shale
Inventors:
Bobby P. Faulkner, Michael H. Weinecke
Patented Case
View Patent ↗
Granted: Jul 24, 1984
Filed: Sep 22, 1982
Inventors
Bobby P. Faulkner
Michael H. Weinecke
Assignee (at issue)
Allis-Chalmers 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.