Granted Patent
Utility
US 4,312,242 · App. 06/120,638
Mechanical vibrator assembly
Inventor:
William F. Wallis
Patented Case
View Patent ↗
Granted: Jan 26, 1982
Filed: Feb 11, 1980
Inventor
William F. Wallis
Assignee (at issue)
BESSER COMPANY
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.