Granted Patent
Utility
US 4,240,495 · App. 05/896,709
Method of making cast metal turbine wheel with integral radial columnar grain blades and equiaxed grain disc
Inventor:
George L. Vonnegut
Patented Case
View Patent ↗
Granted: Dec 23, 1980
Filed: Apr 17, 1978
Inventor
George L. Vonnegut
Assignee (at issue)
General Motors LLC
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.