Nonmetallic building materials Trademarks Filed in February 16, 1971
DUO-AIR
Filed: February 16, 1971
STRUCTURAL SUSPENDED CEILING SYSTEMS FOR DISTRIBUTION OF AIR THROUGH SUSPENDED CEILING MEMBERS
Owned by: DUO-FLEX CORPORATION
Serial Number: 72383875
DUO-FLEX
Filed: February 16, 1971
STRUCTURAL MEMBERS FOR SUSPENSION TYPE CEILINGS
Owned by: DUO-FLEX CORPORATION
Serial Number: 72383876
G
Filed: February 16, 1971
CEMENT FOR CONSTRUCTION PURPOSES
Owned by: GENERAL PORTLAND CEMENT COMPANY
Serial Number: 72383895
