Granted Patent
Utility
US 4,741,617 · App. 06/929,022
Method and apparatus for measuring, magnification power of a magnifying aid
Inventor:
Donald J. Strittmatter
Patented Case
View Patent ↗
Granted: May 3, 1988
Filed: Nov 10, 1986
Inventor
Donald J. Strittmatter
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.