Granted Patent
Utility
US 5,242,770 · App. 07/821,793
Mask for photolithography
Inventors:
Jang Fung Chen, James A. Matthews
Patented Case
View Patent ↗
Granted: Sep 7, 1993
Filed: Jan 16, 1992
Inventors
Jang Fung Chen
James A. Matthews
Assignee (at issue)
MicroUnity Systems Engineering, 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.