Granted Patent
Utility
US 4,933,142 · App. 07/306,216
Low carbon plus nitrogen free-machining austenitic stainless steels with improved machinability and corrosion resistance
Inventors:
Walter T. Haswell, Jr., Kenneth E. Pinnow, John J. Eckenrod, Geoffrey O. Rhodes
Patented Case
View Patent ↗
Granted: Jun 12, 1990
Filed: Feb 3, 1989
Inventors
Walter T. Haswell, Jr.
Kenneth E. Pinnow
John J. Eckenrod
Geoffrey O. Rhodes
Assignee (at issue)
Crucible Materials 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.