Granted Patent
Utility
US 6,552,487 · App. 09/694,635
Phosphor for light sources, and associated light source
Inventors:
Andries Ellens, Franz Zwaschka
Patented Case
View Patent ↗
Granted: Apr 22, 2003
Filed: Oct 23, 2000
Inventors
Andries Ellens
Franz Zwaschka
Assignee (at issue)
Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH
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.