Granted Patent
Utility
US 5,658,612 · App. 08/536,407
Method for making a tantala/silica interference filter on the surface of a tungsten-halogen incandescent lamp
Inventors:
Hongwen Li, Keith A. Klinedinst
Patented Case
View Patent ↗
Granted: Aug 19, 1997
Filed: Sep 29, 1995
Inventors
Hongwen Li
Keith A. Klinedinst
Assignee (at issue)
OSRAM SYLVANIA Inc.
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.