Granted Patent
Utility
US 5,220,863 · App. 07/884,359
Conical diaphragm and method of making
Inventors:
Daniel G. Scott, William K. Mong, Willard P. Spalding
Patented Case
View Patent ↗
Granted: Jun 22, 1993
Filed: May 18, 1992
Inventors
Daniel G. Scott
William K. Mong
Willard P. Spalding
Assignee (at issue)
Westinghouse Air Brake Co.
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.