Granted Patent
Utility
US 4,200,459 · App. 05/860,298
Heat resistant low expansion alloy
Inventors:
Darrell F. Smith, Jr., David G. Tipton, Edward F. Clatworthy, Donald E. Wenschhof, Jr.
Patented Case
View Patent ↗
Granted: Apr 29, 1980
Filed: Dec 14, 1977
Inventors
Darrell F. Smith, Jr.
David G. Tipton
Edward F. Clatworthy
Donald E. Wenschhof, Jr.
Assignee (at issue)
HUNTINGTON ALLOYS 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.