Granted Patent
Utility
US 4,664,722 · App. 06/790,922
Method for protecting from hardening a selected region of a steel structure
Inventors:
Douglas L. Clinkscales, Stephen B. Long, Carl S. Wheeler
Patented Case
View Patent ↗
Granted: May 12, 1987
Filed: Oct 24, 1985
Inventors
Douglas L. Clinkscales
Stephen B. Long
Carl S. Wheeler
Assignee (at issue)
Hughes Tool Company - USA
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.