Granted Patent
Utility
US 4,309,255 · App. 06/185,813
Electrochromic recording paper
Inventors:
Paul Gendler, Barbara D. Grant, Clinton David Snyder
Patented Case
View Patent ↗
Granted: Jan 5, 1982
Filed: Sep 10, 1980
Inventors
Paul Gendler
Barbara D. Grant
Clinton David Snyder
Assignee (at issue)
International Business Machines 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.