Granted Patent
Utility
US 4,405,136 · App. 06/453,401
Pneumatic cartridge seal for computer disc drive cartridge
Inventors:
John W. Elsing, Steven Knopp
Patented Case
View Patent ↗
Granted: Sep 20, 1983
Filed: Dec 27, 1982
Inventors
John W. Elsing
Steven Knopp
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.