Granted Patent
Utility
US 4,048,137 · App. 05/712,616
Elastomeric materials reinforced with small diameter glass fibers
Inventor:
Glenn A. Heitmann
Patented Case
View Patent ↗
Granted: Sep 13, 1977
Filed: Aug 9, 1976
Inventor
Glenn A. Heitmann
Assignee (at issue)
Johns Manville
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.