Granted Patent
Utility
US 4,256,473 · App. 06/082,136
Filter bag attaching means
Inventor:
Dominick De Martino
Patented Case
View Patent ↗
Granted: Mar 17, 1981
Filed: Oct 5, 1979
Inventor
Dominick De Martino
Assignee (at issue)
The Spencer Turbine 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.