Granted Patent
Utility
US 4,456,297 · App. 06/264,486
Dental chair
Inventors:
Helmut Pietschmann, Herbert Lipp
Patented Case
View Patent ↗
Granted: Jun 26, 1984
Filed: May 18, 1981
Inventors
Helmut Pietschmann
Herbert Lipp
Assignee (at issue)
Sybron Corporation
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.