Granted Patent
Utility
US 6,540,366 · App. 09/810,431
Overhead projection system
Inventors:
Vaughn E. Keenan, Robert Sirotich
Patented Case
View Patent ↗
Granted: Apr 1, 2003
Filed: Mar 19, 2001
Inventors
Vaughn E. Keenan
Robert Sirotich
Assignee (at issue)
Smart Technologies, 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.