Granted Patent
Utility
US 4,336,631 · App. 06/138,252
Handle assembly, top-load cartridge
Inventors:
James A. Duff, Donald R. Boisvert
Patented Case
View Patent ↗
Granted: Jun 29, 1982
Filed: May 12, 1980
Inventors
James A. Duff
Donald R. Boisvert
Assignee (at issue)
Magnetic Peripherals, 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.