Granted Patent
Utility
US 4,661,573 · App. 06/851,929
Lens composition articles and method of manufacture
Inventors:
Donald J. Ratkowski, William J. Burke
Patented Case
View Patent ↗
Granted: Apr 28, 1987
Filed: Apr 14, 1986
Inventors
Donald J. Ratkowski
William J. Burke
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.