Del. Code tit. 8, § 511

On or before June 30 in each year, the Secretary of State shall report to the Governor a list of all the corporations, which for 1 year next preceding such report, have failed, neglected or refused to pay the franchise taxes assessed against them or due by them, or to file a complete annual franchise tax report, under the laws of this State, and the Governor shall forthwith issue a proclamation declaring that the charters of these corporations are repealed.