Granted Patent
Utility
US 4,397,472 · App. 06/440,977
Cylinder head gasket with expanded graphite filler
Inventor:
Daniel E. Czernik
Patented Case
View Patent ↗
Granted: Aug 9, 1983
Filed: Nov 12, 1982
Inventor
Daniel E. Czernik
Assignee (at issue)
Felt Products Mfg. 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.