Escrow deposit requirement for excise duty claims mandates timely deposit, approved operations, investment and Committee certification or recovery with interest. Manufacturers claiming exemption must deposit an amount equal to the excise duties that would otherwise be payable into an escrow account within sixty days of each quarter; escrow operations require Commissioner approval and a bond securing payment with interest under section 11AB if amounts are not invested. Deposited sums must be invested within two years and withdrawals reinvested within sixty days. Quarterly statements and investment details are submitted to a designated Committee which, if satisfied, issues a certificate discharging liability; failure to deposit or invest leads to recovery with interest and possible forfeiture of escrowed amounts.