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6. Share-based Compensation (Tables)
3 Months Ended
Mar. 31, 2013
Notes to Financial Statements  
Weighted average assumptions of share based payment

The fair value of share-based payments made to employees and non-employee directors was estimated on the measurement date using the Black-Scholes model using the following weighted average assumptions:

 

    Three Month Period Ended  
    March 31,  
    2013     2012  
Risk free interest rate     ––       0.83%  
Dividend yield     ––       0.0%  
Expected term (in years)     ––       6.0  
Volatility     ––       101%  
Stock compensation expense

We recorded stock compensation expense of $67,382 and $46,688 for the three month periods ended March 31, 2013 and 2012, respectively, as follows:

 

    Three Month Period Ended  
    March 31,  
    2013     2012  
Research and development costs   $ 6,954     $ 6,368  
Sales and marketing costs     630       ––  
General and administrative costs     47,936       37,299  
Cost of product sales     11,862       3,021  
Total   $ 67,382     $ 46,688  
Summary of stock option activity

The following is a summary of stock option activity for the three month period ended March 31, 2013, and the status of stock options outstanding at March 31, 2013:

 

    Three Month Period Ended  
    March 31, 2013  
          Wtd. Avg.  
          Exercise  
    Shares     Price  
Outstanding at beginning of year     20,379,602     $ 0.09  
Granted     ––       ––  
Exercised     (355,856 )     (0.08 )
Forfeited     (150,000 )     (0.08 )
Outstanding at March 31, 2013     19,873,746     $ 0.09  
                 
Stock options exercisable at March 31, 2013     15,285,695     $ 0.08