Granted Patent
Utility
US 5,322,031 · App. 07/990,625
Color change nipple
Inventors:
Michael I. Lerner, Michael S. Bernstein, James D. Hammer
Patented Case
View Patent ↗
Granted: Jun 21, 1994
Filed: Dec 14, 1992
Inventors
Michael I. Lerner
Michael S. Bernstein
James D. Hammer
Assignee (at issue)
Safety 1st, 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.