Granted Patent
Utility
US 4,934,818 · App. 07/328,412
Refractive index profiling technique
Inventors:
Werner J. Glantschnig, Knut D. Pohl
Patented Case
View Patent ↗
Granted: Jun 19, 1990
Filed: Mar 24, 1989
Inventors
Werner J. Glantschnig
Knut D. Pohl
Assignee (at issue)
American Telephone and Telegraph, Co.
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.