Granted Patent
Utility
US 5,296,308 · App. 07/931,221
Investment casting using core with integral wall thickness control means
Inventors:
Charles F. Caccavale, William E. Sikkenga
Patented Case
View Patent ↗
Granted: Mar 22, 1994
Filed: Aug 10, 1992
Inventors
Charles F. Caccavale
William E. Sikkenga
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.