Impaired Goodwill and Amortizotion of Patent. On December 31, It was estimated that goodwill of $56,500 was impaired. In addition, a patent with an estimated useful economic life of 12 years was acquired for $100,800 on April 1. a. Journalize the adjusting entry on December 31 for the impaired goodwill. Dec. 31 b. Joumalize the adjusting entry on December 31 for the amortization of the patent rights. Do not round intermediate calculations. Dec, 31