Granted Patent
Utility
US 4,416,472 · App. 06/219,323
Holddown and packoff apparatus
Inventors:
John H. Fowler, David L. Gruller
Patented Case
View Patent ↗
Granted: Nov 22, 1983
Filed: Dec 22, 1980
Inventors
John H. Fowler
David L. Gruller
Assignee (at issue)
SMITH INTERNATIONAL, INC.
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.