"The three business day period during which you may cancel this contract for any reason by certified mailing or delivering written notice to the invention developer will expire on (last date to mail or deliver notice). If you choose to use certified mail as your notice, it must be placed in the United States mail addressed to (Name of Invention Developer), at (Address of Invention Developer's Place of Business) with first class postage prepaid before midnight of this date. If you choose to personally deliver your notice to the invention developer, it must be delivered to him by the end of his normal business day on this date."
Okla. Stat. tit. 15, § 683