Granted Patent
Utility
US 6,319,413 · App. 09/553,511
Method of filtering liquid using a vertical filter
Inventors:
Yongming Xia, James E. Thompson, Jeffrey S. Devine
Patented Case
View Patent ↗
Granted: Nov 20, 2001
Filed: Apr 20, 2000
Inventors
Yongming Xia
James E. Thompson
Jeffrey S. Devine
Assignee (at issue)
Ashbrook 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.