Granted Patent
Utility
US 4,582,884 · App. 06/646,069
Lens composition, article and method of manufacture
Inventor:
Donald J. Ratkowski
Patented Case
View Patent ↗
Granted: Apr 15, 1986
Filed: Aug 31, 1984
Inventor
Donald J. Ratkowski
Assignee (at issue)
Paragon Optical Inc.
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.