Granted Patent
Utility
US 5,742,242 · App. 08/769,796
Keyboard using pressurized fluid to generate key stroke characteristics
Inventor:
Charles A. Sellers
Patented Case
View Patent ↗
Granted: Apr 21, 1998
Filed: Dec 19, 1996
Inventor
Charles A. Sellers
Assignee (at issue)
Compaq Computer 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.