Cal. Food & Agric. Code § 34531

Any person or association located in California that is engaged in receiving, producing, manufacturing, packing, canning, bottling, handling, or selling milk or any product of milk in containers, cabinets, or other dairy equipment which is marked or otherwise identified with the name of the person or association or with any fictitious or other name or word or with any mark or device whatsoever, and any association or corporation, the members or directors of which are so engaged, may, and as to milk cases shall, file with the department a description of the name or word, mark, or device which is so used, and an application for registration of it as a brand. The application shall be accompanied by a fee of ten dollars ($10) for each separate brand.