Granted Patent
Utility
US 4,005,490 · App. 05/577,970
Magnetic disc memory
Inventors:
Damon H. Duncan, Craig T. Herdman, Terrance V. Littlejohn
Patented Case
View Patent ↗
Granted: Jan 25, 1977
Filed: May 15, 1975
Inventors
Damon H. Duncan
Craig T. Herdman
Terrance V. Littlejohn
Assignee (at issue)
Sperry Rand 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.