Granted Patent
Utility
US 4,640,728 · App. 06/877,595
Method of joining foam patterns for evaporative casting process
Inventors:
Robert A. Martin, Thomas J. Heater
Patented Case
View Patent ↗
Granted: Feb 3, 1987
Filed: Jun 23, 1986
Inventors
Robert A. Martin
Thomas J. Heater
Assignee (at issue)
Ford Motor 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.