Granted Patent
Utility
US 5,888,381 · App. 08/857,418
Water filter with pressure actuated flow monitor
Inventors:
Richard D. Primdahl, Dale A. Squier, John E. Zabinski
Patented Case
View Patent ↗
Granted: Mar 30, 1999
Filed: May 16, 1997
Inventors
Richard D. Primdahl
Dale A. Squier
John E. Zabinski
Assignee (at issue)
United States Filter Corporation
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.