Granted Patent
Utility
US 4,666,821 · App. 06/708,758
Photopolymer for use as a solder mask
Inventors:
Paul R. Hein, Henry C. Miller, W. Darlene Brewster
Patented Case
View Patent ↗
Granted: May 19, 1987
Filed: Mar 6, 1985
Inventors
Paul R. Hein
Henry C. Miller
W. Darlene Brewster
Assignee (at issue)
W. R. Grace & Co.
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.