Granted Patent
Utility
US 6,227,821 · App. 09/537,702
Two-cylinder pump
Inventors:
Shawn Leu, Jeffrey W. Bergner
Patented Case
View Patent ↗
Granted: May 8, 2001
Filed: Mar 28, 2000
Inventors
Shawn Leu
Jeffrey W. Bergner
Assignee (at issue)
THOMAS INDUSTRIES, 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.