11 APPARATUS FOR CONDITIONING AIR AND REGULATING SUNSHINE BY MEANS OF LOUVERS POSITIONED ON TOP OF BUILDINGS AND OPERATED BY DIFFERENTIAL VAPOR PRESSURE THROUGH AN ENCLOSED SYSTEM
Trademark Events
Aug 20, 1996
Expired Sec. 9
Jan 25, 1982
Registered - Sec. 8 (6-Yr) Accepted & Sec. 15 Ack.