Granted Patent
Utility
US 4,662,819 · App. 06/849,997
Centrifugal fan with variable blade pitch
Inventors:
Rodney L. Lakowske, James C. Tischer, David H. Eber
Patented Case
View Patent ↗
Granted: May 5, 1987
Filed: Apr 10, 1986
Inventors
Rodney L. Lakowske
James C. Tischer
David H. Eber
Assignee (at issue)
American Standard 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.