Granted Patent
Utility
US 4,238,299 · App. 06/069,525
Tubing with copper-boron carbide composite facing and methods for its production
Inventor:
Chih-Chung Wang
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: Aug 24, 1979
Inventor
Chih-Chung Wang
Assignee (at issue)
Kennecott Copper Corporation
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.