Impaired Goodwill and Amortization of Patent On April 1, a patent with an estimated useful economic life of 12 years was acquired for $86,400. In addition, on December 31 , it was estimated that goodwill of $49,500 was impaired. a. Record the acquisition of patent. If an amount box does not require an entry, leave it blank. April 1 b. Journalize the adjusting entry on December 31 for the amortization of the patent rights. Do not round intermediate calculations. If an amount box does not require an entry, leave it blank. Dec. 31 c. Journalize the adjusting entry on December 31 for the impaired goodwill. If an amount box does not require an entry, leave it blank. Dec. 31