Granted Patent
Utility
US 6,004,458 · App. 09/014,448
Filter/sanitizer
Inventor:
Donald R. Davidson
Patented Case
View Patent ↗
Granted: Dec 21, 1999
Filed: Jan 28, 1998
Inventor
Donald R. Davidson
Assignee (at issue)
H-TECH AG
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.