Granted Patent
Utility
US 4,720,283 · App. 06/763,266
Baby's marble runway toy
Inventors:
D. Michael Williams, Lawrence B. Grubb
Patented Case
View Patent ↗
Granted: Jan 19, 1988
Filed: Aug 7, 1985
Inventors
D. Michael Williams
Lawrence B. Grubb
Assignee (at issue)
Johnson & Johnson Baby Products Company
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.