Granted Patent
Utility
US 4,820,899 · App. 07/161,944
Laser beam working system
Inventors:
Ikuo Hikima, Akira Miyaji, Saburo Kamiya, Akikazu Tanimoto
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Feb 29, 1988
Inventors
Ikuo Hikima
Akira Miyaji
Saburo Kamiya
Akikazu Tanimoto
Assignee (at issue)
NIKON 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.