Granted Patent
Utility
US 5,954,485 · App. 08/696,532
Free-flow protection devices and methods
Inventors:
Jay G. Johnson, Jia Hu
Patented Case
View Patent ↗
Granted: Sep 21, 1999
Filed: Aug 14, 1996
Inventors
Jay G. Johnson
Jia Hu
Assignee (at issue)
SIMS Deltec, 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.