Granted Patent
Utility
US 4,915,716 · App. 07/202,749
Fabrication of lightguide soot preforms
Inventors:
Douglas W. Monroe, Chenkou Wei
Patented Case
View Patent ↗
Granted: Apr 10, 1990
Filed: Jun 3, 1988
Inventors
Douglas W. Monroe
Chenkou Wei
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.