65 ILCS 5/9-3-48
A deed conveying the fee simple title to the premises, free and clear of all liens and encumbrances, except unpaid general taxes and special assessments, or installments thereof, shall be issued to the purchaser at any time after the expiration of the period of redemption upon proof of payment of all taxes and assessments becoming due subsequent to date of sale, proof of notice to occupant of date of expiration of period of redemption, proof of publication of notice to all parties concerned of the date of expiration of the period of redemption and when and where application will be made for deed. If the court determines that the provisions of this Division 3 are complied with, the court shall direct the general county officer authorized to collect state and county taxes to execute and deliver to the applicant a deed conveying fee simple title to the several tracts of real estate, free and clear of all incumbrances, and liens, except the lien for unpaid general taxes and special assessments, or installments thereof, the lien as to which shall continue unimpaired. Such deed shall refer to the judgment of the court and this Division 3 as the authority by which it is issued. Such deeds shall be recorded as other deeds conveying real estate. After 30 days from the date of filing the deed issued under the provisions of this Division 3 in the recorder's office for recordation, no action shall be instituted to defeat or impair such conveyance.
65 ILCS 5/9-3-48