From the US trademark database. No longer a glass trademark, but gives some info
Word Mark: VITROLITE
Goods and Services: COLORED, OPAQUE-FLAT OR BENT GLASS. FIRST USE: 19070101. FIRST USE IN COMMERCE: 19070101
Serial Number: 71434797
Filing Date: August 8, 1940
Registration Number: 0384005
Registration Date:December 31, 1940
Owner: (LAST LISTED OWNER) LIBBEY-OWENS-FORD GLASS COMPANY CORPORATION OHIO TOLEDO OHIO
Type of Mark: TRADEMARK
Live/Dead Indicator: DEAD