Granted Patent
Utility
US 4,877,516 · App. 07/153,833
Manipulating particulate matter
Inventor:
Cornelius J. Schram
Patented Case
View Patent ↗
Granted: Oct 31, 1989
Filed: Jan 27, 1988
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.