Granted Patent
Utility
US 4,331,409 · App. 06/249,121
Photographic apparatus with dual function sonic transducer
Inventors:
William J. Cianci, Jr., Donato F. Pizzuti
Patented Case
View Patent ↗
Granted: May 25, 1982
Filed: Mar 30, 1981
Inventors
William J. Cianci, Jr.
Donato F. Pizzuti
Assignee (at issue)
Polaroid 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.