Granted Patent
Utility
US 4,814,799 · App. 07/182,271
Method and apparatus for creating a photomask for projecting an image
Inventor:
Sun Lu
Patented Case
View Patent ↗
Granted: Mar 21, 1989
Filed: Apr 15, 1988
Inventor
Sun Lu
Assignee (at issue)
The Mead 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.