Granted Patent
Utility
US 4,174,962 · App. 05/900,634
Filled tubular article for controlled insertion into molten metal
Inventors:
John G. Frantzreb, Sr., C. David Weiss
Patented Case
View Patent ↗
Granted: Nov 20, 1979
Filed: Apr 27, 1978
Inventors
John G. Frantzreb, Sr.
C. David Weiss
Assignee (at issue)
Caterpillar Tractor 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.