Granted Patent
Utility
US 4,566,230 · App. 06/621,483
Impact blasting system for etching metal surfaces
Inventor:
James H. Carpenter
Patented Case
View Patent ↗
Granted: Jan 28, 1986
Filed: Jun 18, 1984
Inventor
James H. Carpenter
Assignee (at issue)
Kennecott Holdings 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.