Granted Patent
Utility
US 4,370,439 · App. 06/022,673
Method of preparing a sizing composition for treating glass fibers
Inventors:
Carl A. Melle, Donald E. McWilliams, Balbhadra Das
Patented Case
View Patent ↗
Granted: Jan 25, 1983
Filed: Mar 22, 1979
Inventors
Carl A. Melle
Donald E. McWilliams
Balbhadra Das
Assignee (at issue)
PPG 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.