Granted Patent
Utility
US 4,992,239 · App. 07/469,139
Khare steel
Inventor:
Ashok K. Khare
Patented Case
View Patent ↗
Granted: Feb 12, 1991
Filed: Jan 24, 1990
Inventor
Ashok K. Khare
Assignee (at issue)
National Forge Company
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.