Granted Patent
Utility
US 4,740,688 · App. 07/025,115
Optical transducers with wavelength coding
Inventor:
Roger Alan Edwards
Patented Case
View Patent ↗
Granted: Apr 26, 1988
Filed: Mar 12, 1987
Inventor
Roger Alan Edwards
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.