Granted Patent
Utility
US 4,820,972 · App. 07/069,457
Wall thickness detector
Inventors:
Paul F. Scott, Donald C. Button, Charles Barclay Reeves, Edward D. Howerter
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Jul 2, 1987
Inventors
Paul F. Scott
Donald C. Button
Charles Barclay Reeves
Edward D. Howerter
Assignee (at issue)
Emhart Industries, 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.