Granted Patent
Utility
US 6,692,187 · App. 10/274,636
Flood gate for door
Inventors:
E. Carl Sprengle, Sr., E. Carl Sprengle, Jr., Michael J. Graham
Patented Case
View Patent ↗
Granted: Feb 17, 2004
Filed: Oct 21, 2002
Inventors
E. Carl Sprengle, Sr.
E. Carl Sprengle, Jr.
Michael J. Graham
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.