Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
John C. Anderson0
William K. Szaroletta0
Date of Patent
September 30, 2008
0Patent Application Number
113289870
Date Filed
January 10, 2006
0Patent Citations Received
Patent Primary Examiner
Patent abstract
Photoelastic elements are formed deliberately with stress concentrations so that, when evaluated with a polariscope, more pronounced isochromatic bands or fringes result when loads are applied to these elements or to assemblies of these elements. A toy for producing color patterns and having polarizing filters coupled to frame elements is disclosed.
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