Granted Patent
Utility
US 4,500,644 · App. 06/562,770
Preparation and composition of sialon grain and powder
Inventors:
Howard M. Winkelbauer, Kenneth W. Hill, Ke-Chin Wang
Patented Case
View Patent ↗
Granted: Feb 19, 1985
Filed: Dec 19, 1983
Inventors
Howard M. Winkelbauer
Kenneth W. Hill
Ke-Chin Wang
Assignee (at issue)
Dresser 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.