Granted Patent
Utility
US 5,890,959 · App. 08/052,751
High efficiency blower system with integral backflow preventor
Inventors:
Julie T. Pettit, Theodore Ernst Bruning, III, Robert Ducharme, Michael K. Ferris, Eugene McNany
Patented Case
View Patent ↗
Granted: Apr 6, 1999
Filed: Mar 31, 1998
Inventors
Julie T. Pettit
Theodore Ernst Bruning, III
Robert Ducharme
Michael K. Ferris
Eugene McNany
Assignee (at issue)
Digital Equipment 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.