Granted Patent
Utility
US 4,883,436 · App. 07/341,292
Kneeboard with retractable fins
Inventor:
Dennis N. Oakland
Patented Case
View Patent ↗
Granted: Nov 28, 1989
Filed: Apr 19, 1989
Inventor
Dennis N. Oakland
Assignee (at issue)
O'Brien International, 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.