Granted Patent
Utility
US 3,935,034 · App. 05/485,528
Boron diffusion coating process
Inventor:
William J. Hayes
Patented Case
View Patent ↗
Granted: Jan 27, 1976
Filed: Jul 3, 1974
Inventor
William J. Hayes
Assignee (at issue)
HOWMET 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.