Applications filed through the USPTO patent electronic filing system must also contain an oath or declaration personally signed by the inventor.
Royal charters were used in England to make the most formal grants of various rights, titles, etc. until the reign of Henry VIII, with letters patent being used for less solemn grants. After the eighth year of Henry VIII, all grants under the Great Seal were issued as letters patent.
The warrant – This contains the monarch's instructions to the Lord Chancellor to prepare letters patent. The Lord Chancellor delivers the said instructions to the Crown Office, who under the guidance of the Clerk of the Crown prepare the patent.
Letters patent, which are defined in the Interpretation Act as a type of regulation, are issued by the Lieutenant Governor in Council under an Order in Council (OIC).
What Is Letters Patent? A letters patent is a type of legal instrument, in the form of a published written order, issued by a governing power, such as a king, president, head of state, or head of a corporation, that gives a person an exclusive right, privilege, title, or office.
Letters patent are a form of open or public proclamation and a vestigial exercise of extra-parliamentary power by a monarch or president. They can thus be contrasted with the Act of Parliament, which is in effect a written order by Parliament involving assent by the monarch in conjunction with its members.