Granted Patent
Utility
US 6,409,478 · App. 09/258,833
Vacuum-assisted pump
Inventors:
William B. Carnes, Milton K. Leonard, Robert B. Ray
Patented Case
View Patent ↗
Granted: Jun 25, 2002
Filed: Feb 26, 1999
Inventors
William B. Carnes
Milton K. Leonard
Robert B. Ray
Assignee (at issue)
Roper Holdings, 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.