During 2016, Indigo Corporation spent $172,800 in research and development costs. As a result, a new product called the New Age Piano was patented. The patent was obtained on October 1, 2016, and had a legal life of 20 years and a useful life of 10 years. Legal costs of $45,360 related to the patent were incurred as of October 1, 2016. Prepare all journal entries required in 2016 and 2017 as a result of the transactions above. (Credit account titles are automatically indented when amount is entered. Do not indent manually. If no entry is required, select "No Entry" for the account titles and enter o for the amounts.) Date Account Titles and Explanation Debit Credit 2016 (To record research and development expenses) 2016 (To record legal expenses) 2016 (To record amortization expense) 2017 On June 1, 2018, Indigo spent $8,280 to successfully prosecute a patent infringement suit. As a result, the estimate of useful life was extended to 12 years from June 1, 2018. Prepare all journal entries required in 2018 and 2019. (Credit account titles are automatically indented when amount is entered. Do not indent manually. If no entry is required, select "No Entry" for the account titles and enter o for the amounts.) Date Account Titles and Explanation Debit Credit 2018 (To record patents) 2018 (To record amortization expense) 2019 SHOW LIST OF ACCOUNTS SHOW ANSWER In 2020, Indigo determined that a competitor's product would make the New Age Piano obsolete and the patent worthless by December 31, 2021. Prepare all journal entries required in 2020 and 2021. (Credit account titles are automatically indented when amount is entered. Do not indent manually. If no entry is required, select "No Entry" for the account titles and enter o for the amounts.) Account Titles and Explanation Debit Credit List Of Accounts Exercise 12-09 Accounts Payable Accounts Receivable Advertising Expense Amortization Expense Buildings Cash Computer Software Costs Copyrights Discount on Bonds Payable Equipment Franchises Goodwill Income Summary Intangible Assets Interest Expense Inventory Land Legal Fees Expense Loss on Impairment No Entry Notes Payable Organization Expense Paid-in Capital in Excess of Par - Common Stock Patents Patent Expense Prepaid Rent Recovery of Loss from Impairment Rent Expense Rent Receivable Rent Revenue Research and Development Expense Retained Earnings Trade Names Trademarks