Granted Patent
Utility
US 4,082,512 · App. 05/753,465
Mixing head for a reaction injection molding machine
Inventors:
Robert D. Wingard, Shirley Margaret Leidal
Patented Case
View Patent ↗
Granted: Apr 4, 1978
Filed: Dec 22, 1976
Inventors
Robert D. Wingard
Shirley Margaret Leidal
Assignee (at issue)
The Upjohn Co.
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.