Illinois Statutes Chapter 770. Liens § 70/10. Contents and filing of statement of lien

(1) The name of an owner of the leasehold or pipeline, and the operator, if known, or the “permittee” and such owner's and operator's mailing address, if known.

(2) A legal description of the leasehold to which the lien extends using the description required by Section 3 B, or a legal description of the pipeline involved.

(3) The nature and dates of the labor performed or materials or services furnished.

(4) Said statement of lien must be filed within four months after the date on which the claimant's labor was last performed or materials or services were last furnished under a single contract as provided for in Section 9. In no event shall such statement of lien be effective as to labor performed or materials or services furnished more than 2 years prior to the filing of the statement of lien in the Recorder's Office. A copy of the statement of lien shall be delivered personally to an owner of the leasehold or pipeline, and the operator, if known, or to the permittee, or by registered or certified mail deposited in the United States mails. Failure to serve a copy of such statement of lien shall not in any manner serve to invalidate the same.