Granted Patent
Utility
US 4,510,446 · App. 06/438,768
Test coupons for determining the registration of subsurface layers in a multilayer printed circuit board
Inventors:
Robert E. Braun, John E. Benasutti
Patented Case
View Patent ↗
Granted: Apr 9, 1985
Filed: Nov 3, 1982
Inventors
Robert E. Braun
John E. Benasutti
Assignee (at issue)
Burroughs, 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.