Granted Patent
Utility
US 6,420,514 · App. 09/615,013
Transparent polysulfone articles with reduced spurious coloration
Inventors:
Martin L. Hage, Edward A. Travnicek
Patented Case
View Patent ↗
Granted: Jul 16, 2002
Filed: Jul 12, 2000
Inventors
Martin L. Hage
Edward A. Travnicek
Assignee (at issue)
Vision-Ease Lens
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.