Patent information:

Patent:Utility 1,304,623
Patented:May 27, 1919
Applied:June 24, 1915
Title:Glass
Description:Boro-silicate glass (Corning Pyrex glass)
Category:Boron
Assigned to:Corning Glass Works

Patentee Information:

SULLIVAN, Eugene C. Corning, NY
TAYLOR, William C. Corning, NY

Class and subclass information:

Class:501COMPOSITIONS: CERAMIC
Subclass:66CERAMIC COMPOSITIONS Glass compositions, compositions containing glass other than those wherein glass is a bonding agent, or glass batch forming compositions Silica containing 40 percent - 90 percent by weight silica And boron And aluminum;
Class:122LIQUID HEATERS AND VAPORIZERS
Subclass:23 
Class:174ELECTRICITY: CONDUCTORS AND INSULATORS
Subclass:209INSULATORS Sectional, multi-part, composite, or coated;

Known specimens:

Number:Specimen known