Granted Patent
Utility
US 6,090,284 · App. 09/170,870
Underdrain unit for granular filtration system
Inventors:
Milton R. Melber, Gary D. Haggard
Patented Case
View Patent ↗
Granted: Jul 18, 2000
Filed: Oct 13, 1998
Inventors
Milton R. Melber
Gary D. Haggard
Assignee (at issue)
Enviroquip 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.