Illinois Administrative Code
Title 68 - PROFESSIONS AND OCCUPATIONS
Part 1380 - THE PROFESSIONAL ENGINEERING PRACTICE ACT OF 1989
Section 1380.295 - Seal and Signature Requirements

a) Every licensed professional engineer shall have a reproducible seal or facsimile, which may be computer generated, the impression of which shall contain the name, the license number of the professional engineer, and the words "Licensed Professional Engineer of Illinois". A professional engineer shall seal all documents prepared by or under the direct supervision and control of the professional engineer. Any document that bears the name of a professional design firm, rather than bearing the name of the individual licensed professional engineer responsible for the document, shall be deemed an invalid seal. The individual licensee's written signature and date of signing, along with the date of license expiration, shall be placed adjacent to the seal. The licensee may provide, at his or her sole discretion, an original signature in the licensee's handwriting, a scanned copy of the document bearing an original signature, or a signature generated by a computer.

b) All technical submissions issued by a professional engineering firm, corporation, professional limited liability company, limited liability company or partnership are required to bear the corporate or assumed business name and design firm registration number, in addition to the seal requirements.

c) A suggested facsimile of the design and lettering of the seal is found in Section 1380.ILLUSTRATION A.