The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 09, 2009
Filed:
Apr. 30, 2007
Applicants:
Brad E. Koerner, Boston, MA (US);
Kevin J. Dowling, Westford, MA (US);
Inventors:
Brad E. Koerner, Boston, MA (US);
Kevin J. Dowling, Westford, MA (US);
Assignee:
Philips Solid-State Lighting Solutions, Inc., Burlington, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F21V 33/00 (2006.01); A47B 19/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
Disclosed herein are methods and apparatus for providing a luminous writing surface, whose color, color temperature, and/or brightness are controlled to achieve a desired contrast between the writing surface and markings removably made thereon. For example, LED-based light sources and/or LED-based controllable lighting units can be employed to back-light or edge-light a transparent or translucent material thereby providing the luminous writing surface.