N.D. Cent. Code § 48-01.2-03: Specified brands, marks, names, or patented articles may not be specified

A governing body, in specifying materials to be used for a public improvement or in plans or specifications for a public improvement, may not request bids for any article of a specified or copyrighted brand or name, the product of any one manufacturer, or any patented apparatus or appliance when the requirement will prevent proper competition, unless the specifications also request bids on other similar articles of equal value, utility, and merit or unless as provided in section 44-08-01.