Granted Patent
Utility
US 4,573,642 · App. 06/607,648
Water powered waste disposer with improved dynamic seal
Inventor:
Leonard G. Spelber
Patented Case
View Patent ↗
Granted: Mar 4, 1986
Filed: May 7, 1984
Inventor
Leonard G. Spelber
Assignee (at issue)
Wastemate Corporation
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.