Fields Laboratories holds a valuable patent (No. 758-6002-1A) on a precipitator that prevents certain types of air pollution. Fields does not manufacture or sell the products and processes it develops. Instead, it conducts research and develops products and processes which it patents, and then assigns the patents to manufacturers on a royalty basis Occasionally it sells a patent. The history of Fields patent number 758-6002-1A is as follows Activity Date Cost 2008-2009 Jan. 2010 March 2010 Jan. 2011 Research conducted to develop precipitator Design and construction of a prototype Testing of models Fees paid engineers and lawyers to prepare patent application; $374,000 87,000 63,000 patent granted June 30, 2011 Engineering activity necessary to advance the design of the 76,500 Nov. 2012 precipitator to the manufacturing stage Legal fees paid to successfully defend precipitator patent Research aimed at modifying the design of the patented precipitator Legal fees paid in unsuccessful patent infringement suit against a 87,500 63,000 64,000 Dec. 2013 April 2014 July 2018 33,000 competitor Fields assumed a useful life of 17 years when it received the initial precipitator patent. On January 1, 2016, it revised its useful life estimate downward to 5 remaining years. Amortization is computed for a full year if the cost is incurred prior to July 1, and no amortization for the year if the cost is incurred after June 30. The company's year ends December 31 Compute the carrying value of patent No. 758-6002-1A on each of the following dates (a) December 31, 2011 (b) December 31, 2015 (c) December 31, 2018