Note 9 - Common stock warrants

The Company's Plan of Reorganization provided for the creditors and claimants to receive new warrants in settlement of their claims. In 2008, the term of the warrants, initially sixteen months, was extended by the Company until May 11, 2038. Management believes that identification of a specific expiration date was merely a formality and that this was not a material change from the automatic extensions which were initially provided for by vote of the board of directors and which were being performed annually since issuance, and also because the shareholders and warrant holders were primarily the same.  The Company recorded no accounting impact as a result of the extension.

Each warrant is callable by the Company if the share price exceeds the exercise price by the lesser of $1 or 100%. The warrant holders have a minimum of 30 to 90 calendar days during which to exercise their warrants once they are called. The Company may lower the exercise price of the warrants at any time.  Similarly, the Company could, but does not anticipate, reverse splitting the stock to raise the stock price above the warrant exercise price.  The warrants are specifically not affected and do not split with the shares in the event of a reverse split.  If the warrants are not exercised, the Company has the right to designate the warrants to a new holder in return for a $0.10 per share redemption fee payable to the original warrant holder as discussed further in Note 10.  All such changes in the exercise price of series A, B, C and D warrants were provided for by the court in the Plan of Reorganization in order to provide a mechanism for debtors to receive value.  Therefore, Management believes that the act of lowering the exercise price is not a change from the original warrant grants and the Company has not recorded an accounting impact as the result of such change in exercise prices.

Exercise prices at December 31, 2012 and subsequent lower prices for the A, B, C and D warrants are as follow:

At November 8, 2009, the Company entered into an Investment Banking agreement with Network One Securities, LLC and a related Strategic Advisory Agreement with Lenox Hill Partners, LP with regard to a potential merger with a cancer development company.  In conjunction with those related agreements, the Company issued 81,699 Series E ($1) Warrants, 369,037 Series F ($3) Warrants, 85,579 Series G ($0.65) Warrants and 689,159 Series H ($7) Warrants, all with a 30 year life.  The warrants are subject to cashless exercise based upon the ten day trailing closing bid price preceding the exercise as interpreted by the Company.   The fair value of the warrants issued under the agreements was estimated on the date of the issuance using the Black-Scholes option pricing model.  The use of a valuation model requires the Company to make certain assumptions with respect to selected model inputs.  Expected volatility was calculated based on the historical volatility of the Company’s stock price.  The average expected life is based on the contractual term of the warrant and expected exercise behavior.  The risk-free interest rate is based on U.S. Treasury zero-coupon issues with a remaining term equal to the expected life assumed at the date of grant.  

The following table provides the assumptions used to value the options granted and warrants issued using the Black-Scholes option pricing model:

As of December 31, 2014 and 2013 the weighted average contractual life for all Mentor warrants was 23.4 years and 24.5 years, respectively, and the weighted average outstanding warrant exercise price was $1.84 and $4.92 per share, respectively.

During the years ended December 31, 2014 and 2013, a total of 8,018,978 and 2,619,332 warrants were exercised, respectively. There were no warrants issued during the years ended December 31, 2014 and 2013.  The intrinsic value of outstanding warrants at December 31, 2014 and 2013 was $2,250 and $1,553,055, respectively.

The following table summarizes common stock warrants as of each period:

Series E, F, G and H warrants were issued for investment banking and advisory services during 2009.  The following table summarizes E, F, G and H warrants as of each period: