Granted Patent
Utility
US 4,587,649 · App. 06/783,279
Method of growth of a digital switchblock
Inventor:
Thomas S. Maddern
Patented Case
View Patent ↗
Granted: May 6, 1986
Filed: Oct 4, 1985
Inventor
Thomas S. Maddern
Assignee (at issue)
The Plessey Company PLC
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.