Granted Patent
Utility
US 4,995,691 · App. 07/421,677
Angled optical fiber input end face and method for delivering energy
Inventor:
Earl E. Purcell, Jr.
Patented Case
View Patent ↗
Granted: Feb 26, 1991
Filed: Oct 16, 1989
Inventor
Earl E. Purcell, Jr.
Assignee (at issue)
Ensign Bickford Optics 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.