Granted Patent
Utility
US 4,988,175 · App. 07/432,706
Optical magnifying system
Inventors:
Donald J. Strittmatter, David R. Wickholm
Patented Case
View Patent ↗
Granted: Jan 29, 1991
Filed: Nov 7, 1989
Inventors
Donald J. Strittmatter
David R. Wickholm
Assignee (at issue)
Hughes Aircraft Company
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.