Trademark Overview
On Tuesday, December 19, 1961, a trademark application was filed for KEYSTONE with the United States Patent and Trademark Office. The USPTO has given the KEYSTONE trademark a serial number of 72134345. The federal status of this trademark filing is EXPIRED as of Thursday, October 1, 1987. This trademark is owned by J. F. PRITCHARD & CO. OF CALIFORNIA. The KEYSTONE trademark is filed in the Environmental Control Instrument Products category with the following description:
COOLING TOWERS