Granted Patent
Utility
US 6,228,477 · App. 09/249,519
Porous membrane structure and method
Inventors:
Robert John Klare, David E. Chubin
Patented Case
View Patent ↗
Granted: May 8, 2001
Filed: Feb 12, 1999
Inventors
Robert John Klare
David E. Chubin
Assignee (at issue)
BHA Technologies, 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.