The following patent information was compiled from the Official Gazette of the United States Patent and Trademark Office and the PCT Gazette, which abstracts international patent applications filed under the auspices of the World Intellectual Property Organization (WIPO) in Geneva, Switzerland. Printed copies of patents issued in the United States may be obtained for $1 from the Commissioner of Patents and Trademarks, U.S. Patent Office, Box 9, Washington, DC 20231. Patents are also on file at 38 patent depository libraries throughout the United States. Copies of patents listed in the PCT Gazette can be obtained from the Foreign Patents Section of the U.S. Patent Office, Box 9, Washington, DC 20231; the documents may also be obtained from Pergamon International Information Corporation, 1340 Old Chain Bridge Rd., McLean, VA, and from WIPO, 34, chemin des Colombettes, CH-1211 Geneva 20 Switzerland.
