Granted Patent
Utility
US 4,704,342 · App. 06/719,020
Photomask having a patterned carbon light-blocking coating
Inventors:
William I. Lehrer, P. Anthony Crossley
Patented Case
View Patent ↗
Granted: Nov 3, 1987
Filed: Apr 2, 1985
Inventors
William I. Lehrer
P. Anthony Crossley
Assignee (at issue)
FAIRCHILD SEMICONDUCTOR 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.