Granted Patent
Utility
US 6,570,302 · App. 09/671,127
Electric lamp with light-absorbing medium and interference film
Inventors:
Erik Boonekamp, Mathias Hubertus Johannes Van Rijswick, Hendrik Adrianus Van Sprang, Gerhard Hebbinghaus
Patented Case
View Patent ↗
Granted: May 27, 2003
Filed: Sep 27, 2000
Inventors
Erik Boonekamp
Mathias Hubertus Johannes Van Rijswick
Hendrik Adrianus Van Sprang
Gerhard Hebbinghaus
Assignee (at issue)
KONINKLIJKE PHILIPS ELECTRONICS NV
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.