Granted Patent
Utility
US 4,983,550 · App. 07/236,042
Hollow glass spheres
Inventors:
Kenneth E. Goetz, James A. Hagarman, Joseph P. Giovene, Jr.
Patented Case
View Patent ↗
Granted: Jan 8, 1991
Filed: Aug 24, 1988
Inventors
Kenneth E. Goetz
James A. Hagarman
Joseph P. Giovene, Jr.
Assignee (at issue)
Potters Industries, LLC
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.