Granted Patent
Utility
US 4,837,210 · App. 07/007,252
Fluoran derivatives and their use in recording materials
Inventors:
Patricia Dwyer-Hallquist, William Joshua Becker, Robert E. Miller, Kenneth D. Glanz
Patented Case
View Patent ↗
Granted: Jun 6, 1989
Filed: Jan 27, 1987
Inventors
Patricia Dwyer-Hallquist
William Joshua Becker
Robert E. Miller
Kenneth D. Glanz
Assignee (at issue)
Appleton Papers 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.