Granted Patent
Utility
US 5,156,738 · App. 07/718,954
Apparatus for uniformly distributing gas and/or liquid in an underdrain lateral system
Inventor:
Richard C. Maxson
Patented Case
View Patent ↗
Granted: Oct 20, 1992
Filed: Jun 21, 1991
Inventor
Richard C. Maxson
Assignee (at issue)
Johnson Filtration Systems
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.