Granted Patent
Utility
US 4,520,189 · App. 06/601,619
Optical device including birefringent aromatic amino carboxylic acid polymer
Inventors:
Howard G. Rogers, Ruth C. Bilofsky, Russell Gaudiana, Ronald A. Sahatjian
Patented Case
View Patent ↗
Granted: May 28, 1985
Filed: Apr 18, 1984
Inventors
Howard G. Rogers
Ruth C. Bilofsky
Russell Gaudiana
Ronald A. Sahatjian
Assignee (at issue)
Polaroid Corporation
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.