Granted Patent
Utility
US 4,752,831 · App. 07/053,509
Focusing system for camera apparatus
Inventors:
Conrad H. Biber, William T. Vetterling, Donald S. Levinstone, Olin C. Brown, III
Patented Case
View Patent ↗
Granted: Jun 21, 1988
Filed: May 15, 1987
Inventors
Conrad H. Biber
William T. Vetterling
Donald S. Levinstone
Olin C. Brown, III
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.