Granted Patent
Utility
US 4,899,302 · App. 07/311,168
Arithmetic unit for inverse trigonometric function
Inventor:
Misayo Nakayama
Patented Case
View Patent ↗
Granted: Feb 6, 1990
Filed: Feb 15, 1989
Inventor
Misayo Nakayama
Assignee (at issue)
NEC 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.