Granted Patent
Utility
US 5,006,266 · App. 07/375,010
Manipulating means utilizing ultrasonic wave energy for use with particulate material
Inventor:
Cornelius J. Schram
Patented Case
View Patent ↗
Granted: Apr 9, 1991
Filed: Aug 2, 1989
Inventor
Cornelius J. Schram
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.