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:
Jul. 08, 2014
Filed:
Apr. 30, 2010
Applicants:
David Schroeder, Aurora, IL (US);
Graham Bogda, Yorkville, IL (US);
Brendan Vishoot, Lake Zurich, IL (US);
Inventors:
David Schroeder, Aurora, IL (US);
Graham Bogda, Yorkville, IL (US);
Brendan Vishoot, Lake Zurich, IL (US);
Assignee:
Board of Trustees of Northern Illinois University, DeKalb, IL (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G09B 21/00 (2006.01); B41J 3/32 (2006.01);
U.S. Cl.
CPC ...
Abstract
According to the present invention, there is provided an improved refreshable tactile display apparatus including a housing, bias compression springs, sliding blocks, pins, and a shape memory alloy wire. The sliding block is actuated by the interaction between the bias compression spring and the shape memory alloy wire. The shape memory alloy wire is then activated by current driven from a power supply in either a modulated or unmodulated fashion.