Granted Patent
Utility
US 4,837,573 · App. 07/164,657
Digital to analog converter
Inventor:
Douglas W. Brooks
Patented Case
View Patent ↗
Granted: Jun 6, 1989
Filed: Mar 3, 1988
Inventor
Douglas W. Brooks
Assignee (at issue)
Process Automation Business, 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.