Note 5  Intellectual Property and License Agreement Intellectual Property partially consists of technology acquired from the purchase of 100% of the membership interests of Cornerstone Conservation Group LLC (Cornerstone) on March 30, 2012 for $659,440. Accumulated amortization with respect to this intellectual property was $659,440 at June 30, 2018 and December 31, 2017. On June 30, 2015, the Company entered into an Assignment Agreement with VyrexIP Holdings Inc., a company owned by Company shareholder Edward Gomez, for the purchase of intellectual property. The net price of these assets was comprised of a down payment of $16,116 and a $58,436 promissory note to the seller due July 15, 2016, partially offset by assignment by the seller to the Company of a $38,000 promissory note due November 14, 2015, issued by the sellers licensee Epalex Corporation, a company of which Mr. Gomez is chairman and a major stockholder. This note was paid in full in November 2015. Accumulated amortization with respect to this intellectual property was $32,834 and $30,460 at June 30, 2018 and December 31, 2017, respectively. On June 1, 2016, the Company entered into a ten-year License Agreement with Helidyne LLC for total consideration of $100,000 to utilize the Helidyne intellectual property in the manufacturing of planetary rotor expanders and the incorporation of same in the Companys distributed electric power generation systems. The license agreement also grants the Company an exclusive license to sell the expanders whether manufactured by Helidyne or by the Company. The Companys royalty obligation begins on the earlier of the commercialization of the product or three years from the effective date of the agreement. Once the royalty obligation begins, the minimum annual royalty is $50,000 for each of the first six years, and $100,000, per commercial year, for the remainder of the agreement. For the six months ended June 30, 2018 and 2017, amortization expense was $7,374 and $11,092, respectively, and accumulated amortization