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Patents
12 Months Ended
Dec. 31, 2013
Patents

NOTE H — PATENTS

Patents are being amortized by the straight-line method over estimated useful lives ranging from 10 to 20 years, with a weighted average amortization period of 12 years. Amortization expense amounted to $77,947 in 2013 and $76,317 in 2012. Estimated amortization expense of existing patents for each of the next five fiscal years amounts to approximately $78,000 per year.