Granted Patent
Utility
US 4,858,158 · App. 07/135,441
Apparatus and method for converting rotation angle width into time width
Inventor:
Masataka Ishikawa
Patented Case
View Patent ↗
Granted: Aug 15, 1989
Filed: Dec 21, 1987
Inventor
Masataka Ishikawa
Assignee (at issue)
Diesel Kiki Co., Ltd.
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.