Granted Patent
Utility
US 4,518,921 · App. 06/435,057
Track and hold circuit
Inventor:
Shawn M. Logan
Patented Case
View Patent ↗
Granted: May 21, 1985
Filed: Oct 18, 1982
Inventor
Shawn M. Logan
Assignee (at issue)
AT&T Bell Laboratories
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.