Impaired Goodwill and Amortization of Patent On April 1, a patent with an estimated useful economic life of 12 years was acquired for $43,200. In addition, on December 31, it was estimated that goodwill of $52,000 was impaired. suits. Pay dose attention to the date of purchase. 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 Loss from Impaired Goodwill 41,035.34 X Goodwill