Granted Patent
Utility
US 5,491,504 · App. 08/091,487
Thermal transfer printer ink ribbon-changing carousel apparatus and method
Inventor:
H. Erwin Grellman
Patented Case
View Patent ↗
Granted: Feb 13, 1996
Filed: Jul 13, 1993
Inventor
H. Erwin Grellman
Assignee (at issue)
Textronix, 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.