Granted Patent
Utility
US 4,904,863 · App. 07/275,990
Polarimetric optical fiber pressure sensor
Inventor:
Graham McDearmon
Patented Case
View Patent ↗
Granted: Feb 27, 1990
Filed: Nov 25, 1958
Inventor
Graham McDearmon
Assignee (at issue)
L'ORÉAL
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.