Granted Patent
Utility
US 4,623,030 · App. 06/789,515
Piezoelectric ratio weighing device
Inventors:
Joe L. Portman, Jr., David J. Margraf
Patented Case
View Patent ↗
Granted: Nov 18, 1986
Filed: Oct 21, 1985
Inventors
Joe L. Portman, Jr.
David J. Margraf
Assignee (at issue)
Alcor, Inc.
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.