Granted Patent
Utility
US 4,278,490 · App. 06/106,135
Sleeve for changing diameter of collapsible mandrel
Inventors:
Robert G. Pistole, Walter Stoll, Leo A. Oswald
Patented Case
View Patent ↗
Granted: Jul 14, 1981
Filed: Dec 21, 1979
Inventors
Robert G. Pistole
Walter Stoll
Leo A. Oswald
Assignee (at issue)
Owens-Corning Fiberglas Corp.
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.