Granted Patent
Utility
US 4,820,913 · App. 06/937,648
Multiple card recording system
Inventor:
Richard M. Haddock
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Dec 2, 1986
Inventor
Richard M. Haddock
Assignee (at issue)
Drexler Technology 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.