Granted Patent
Utility
US 6,431,014 · App. 09/360,466
High accuracy aerosol impactor and monitor
Inventors:
Benjamin Y. H. Liu, Virgil A. Marple
Patented Case
View Patent ↗
Granted: Aug 13, 2002
Filed: Jul 23, 1999
Inventors
Benjamin Y. H. Liu
Virgil A. Marple
Assignee (at issue)
MSP 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.