Granted Patent
Utility
US 6,578,987 · App. 09/565,040
Intra-lens color and dimming apparatus
Inventors:
Thomas A. Hough, Richard K. Steele
Patented Case
View Patent ↗
Granted: Jun 17, 2003
Filed: May 3, 2000
Inventors
Thomas A. Hough
Richard K. Steele
Assignee (at issue)
Vari-Lite, 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.