Impaired Goodwill and Amortization of Patent On December 31, it was estimated that goodwill of $4,000,000 was impaired. In addition, a patent with an estimated useful economic life of 1 years was acquired for $900,000 on August 1. a. Journalize the adjusting entry on December 31 for the impaired goodwill. Dec. 31 b. Journalize the adjusting entry on December 31 for the amortization of the patent rights. Dec. 31