Granted Patent
Utility
US 4,277,332 · App. 06/128,596
Water purifier
Inventor:
John W. Baughn
Patented Case
View Patent ↗
Granted: Jul 7, 1981
Filed: Mar 10, 1980
Inventor
John W. Baughn
Assignee (at issue)
Gelman Sciences
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.