Granted Patent
Utility
US 5,200,107 · App. 07/749,788
Polymethylmethacrylate syrup as medium for liquid crystals
Inventors:
Virginia Piermattie, Sharon Elliot
Patented Case
View Patent ↗
Granted: Apr 6, 1993
Filed: Aug 26, 1991
Inventors
Virginia Piermattie
Sharon Elliot
Assignee (at issue)
Aristech Chemical 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.