Granted Patent
Utility
US 4,231,848 · App. 06/035,695
Method for making a raw board for use in printed circuits
Inventors:
Yoshio Kawasumi, Haruki Sato
Patented Case
View Patent ↗
Granted: Nov 4, 1980
Filed: May 3, 1979
Inventors
Yoshio Kawasumi
Haruki Sato
Assignee (at issue)
Nippon Mining Company Limited
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.