Granted Patent
Utility
US 6,539,829 · App. 09/325,294
Rotary valve assembly and method
Inventors:
Greg M. Kauppila, Andrew P. Tijan
Patented Case
View Patent ↗
Granted: Apr 1, 2003
Filed: Jun 3, 1999
Inventors
Greg M. Kauppila
Andrew P. Tijan
Assignee (at issue)
C.G. Bretting Manufacturing Co., 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.