Granted Patent
Utility
US 4,668,609 · App. 06/787,946
Reduction of deflection errors in E-beam recording
Inventor:
Henry Seiwatz
Patented Case
View Patent ↗
Granted: May 26, 1987
Filed: Oct 16, 1985
Inventor
Henry Seiwatz
Assignee (at issue)
GAF 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.