Granted Patent
Utility
US 6,273,124 · App. 09/578,625
Check valve floor drain
Inventors:
Donald G. Huber, Allen I. Stakset
Patented Case
View Patent ↗
Granted: Aug 14, 2001
Filed: May 25, 2000
Inventors
Donald G. Huber
Allen I. Stakset
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.