Granted Patent
Utility
US 4,185,137 · App. 05/842,764
Conductive sheath/core heterofilament
Inventor:
Richard L. Kinkel
Patented Case
View Patent ↗
Granted: Jan 22, 1980
Filed: Oct 17, 1977
Inventor
Richard L. Kinkel
Assignee (at issue)
Fiber 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.