Granted Patent
Utility
US 4,887,492 · App. 07/237,747
Method for making low alpha count lead
Inventors:
John A. Dunlop, Edward F. G. Milner, Robert W. Smyth, Gerald W. Toop
Patented Case
View Patent ↗
Granted: Dec 19, 1989
Filed: Aug 29, 1988
Inventors
John A. Dunlop
Edward F. G. Milner
Robert W. Smyth
Gerald W. Toop
Assignee (at issue)
Cominco Electronic Materials 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.