Granted Patent
Utility
US 4,761,551 · App. 06/933,949
Optical transducer with movable filter
Inventors:
Roger Alan Edwards, Peter Gardiner
Patented Case
View Patent ↗
Granted: Aug 2, 1988
Filed: Nov 24, 1986
Inventors
Roger Alan Edwards
Peter Gardiner
Assignee (at issue)
Smiths Industries Public Limited Company
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.