Granted Patent
Utility
US 5,101,220 · App. 07/502,085
Chart recorder with thermal print head and sound generator
Inventor:
Michael J. Sullivan
Patented Case
View Patent ↗
Granted: Mar 31, 1992
Filed: Mar 29, 1990
Inventor
Michael J. Sullivan
Assignee (at issue)
ASTRO-MED, 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.