Granted Patent
Utility
US 4,244,820 · App. 05/906,499
Fluid purification system
Inventors:
Dale I. Hauk, Gerald Tanny
Patented Case
View Patent ↗
Granted: Jan 13, 1981
Filed: May 16, 1978
Inventors
Dale I. Hauk
Gerald Tanny
Assignee (at issue)
Gelman Instrument Company
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.