Granted Patent
Utility
US 4,868,013 · App. 07/165,187
Fluidized bed process
Inventor:
Robert H. Allen
Patented Case
View Patent ↗
Granted: Sep 19, 1989
Filed: Mar 7, 1988
Inventor
Robert H. Allen
Assignee (at issue)
Ethyl 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.