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Intangible Assets
12 Months Ended
Dec. 31, 2011
Notes to Financial Statements  
Intangible Assets

4.  Intangible Assets  
Intangible assets consisted of:   2011     2010  
Patents   $ 1,885,888     $ 1,794,754  
Trademarks     565,273       554,590  
Pac-Kit Tradename, Customer List     1,500,000       -  
      3,951,161       2,349,344  
Accumulated amortization     666,498       483,113  
    $ 3,284,663     $ 1,866,231  

 

Amortization expense for patents and trademarks for the years ended December 31, 2011, and 2010 were $183,385 and $114,822, respectively.   The estimated aggregate amortization expense for each of the next five succeeding years, calculated on a similar basis, is as follows:  2012 - $195,423; 2013 - $195,283; 2014 - $182,053; 2015 - $169,345; and 2016 - $167,521.