37 CFR § 2.53 - Requirements for drawings filed through the TEAS.
The drawing must meet the requirements of § 2.52. In addition, in a TEAS submission, the drawing must meet the following requirements:
(a) Standard character drawings. If an applicant seeks registration of a standard character mark, the applicant must enter the mark in the appropriate field on the TEAS form, and check the box to claim that the mark consists of standard characters.
(b) Special form drawings: If an applicant is filing a special form drawing, the applicant must attach a digitized image of the mark to the TEAS submission that meets the requirements of paragraph (c) of this section.
(c) Requirements for digitized image: The image must be in .jpg format and scanned at no less than 300 dots per inch and no more than 350 dots per inch with a length and width of no less than 250 pixels and no more than 944 pixels. All lines must be clean, sharp and solid, not fine or crowded, and produce a high quality image when copied.