Granted Patent
Utility
US 4,573,091 · App. 06/441,762
Cartridge tape drive
Inventors:
William M. Barton, Jr., John F. Murphy, Karl B. Offerman, Richard G. Fisher
Patented Case
View Patent ↗
Granted: Feb 25, 1986
Filed: Nov 15, 1982
Inventors
William M. Barton, Jr.
John F. Murphy
Karl B. Offerman
Richard G. Fisher
Assignee (at issue)
Cipher Data Products, 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.