According to the TESS database for the US Trademark and Patent Office the registered address for the Sky & Telescope trademark is: AAS SKY PUBLISHING, LLC LIMITED LIABILITY COMPANY D.C. 1667 K ST, NW, SUITE 800 WASHINGTON D.C. 20006
The American Astronomical Society who owns the IP rights have just renewed the S&T trademarks they own. You could try contacting S&T through their owners the AAS;