Granted Patent
Utility
US 4,490,389 · App. 06/485,093
Contact lens preserving solution containing ascorbic acid or salts thereof
Inventors:
Eric L. Nelson, Richard L. Harris
Patented Case
View Patent ↗
Granted: Dec 25, 1984
Filed: Jun 13, 1983
Inventors
Eric L. Nelson
Richard L. Harris
Assignee (at issue)
Nelson Research & Development 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.