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Patents
12 Months Ended
Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]  
Patents

NOTE I — 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 $69,428 in 2015 and $78,458 in 2014. Estimated amortization expense of existing patents for each of the next five fiscal years amounts to approximately $79,000 per year.