Granted Patent
Utility
US 6,485,231 · App. 09/821,397
Foundation flood gate with ventilation
Inventors:
Martin J. Montgomery, E. Carl Sprengle, Sr.
Patented Case
View Patent ↗
Granted: Nov 26, 2002
Filed: Mar 29, 2001
Inventors
Martin J. Montgomery
E. Carl Sprengle, Sr.
Assignee (at issue)
Smart Vent, Inc.
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.