Granted Patent
Utility
US 4,644,659 · App. 06/742,869
Transit
Inventor:
Akio Takahama
Patented Case
View Patent ↗
Granted: Feb 24, 1987
Filed: Jun 10, 1985
Inventor
Akio Takahama
Assignee (at issue)
Nippon Kogaku K.K.
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.