Granted Patent
Utility
US 4,283,594 · App. 06/104,617
Vacuum apparatus having protective device for operator and method
Inventor:
M. John Somers
Patented Case
View Patent ↗
Granted: Aug 11, 1981
Filed: Dec 17, 1979
Inventor
M. John Somers
Assignee (at issue)
DayCo Holdings, LP
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.