Granted Patent
Utility
US 4,832,494 · App. 07/057,028
Optical inspection
Inventor:
John R. Tyrer
Patented Case
View Patent ↗
Granted: May 23, 1989
Filed: Jun 3, 1987
Inventor
John R. Tyrer
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.