Patent information:
| Patent: | Utility 1,923,221 |
| Patented: | August 22, 1933 |
| Applied: | March 23, 1931 |
| Title: | Process of Melting Glass |
| Description: | Boro-silicate glass, method to make colorless by using graphite pot |
| Category: | Boron |
| Assigned to: | Corning Glass Works |
Patentee Information:
Class and subclass information:
| Class: | 65 | GLASS MANUFACTURING |
| Subclass: | 30.1 | PROCESSES; With chemically reactive treatment of glass preform; |
| Class: | 501 | COMPOSITIONS: CERAMIC |
| Subclass: | 31 | CERAMIC COMPOSITIONS; Glass compositions, compositions containing glass other than those wherein glass is a bonding agent, or glass batch forming compositions; Glass batch forming compositions (i.e., glass batch compositions); Uncombined silica containing (e.g., sand); |
| Class: | 501 | COMPOSITIONS: CERAMIC |
| Subclass: | 59 | CERAMIC 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 halogen or nitrogen; Fluorine; And boron; And aluminum; |
| Class: | 501 | COMPOSITIONS: CERAMIC |
| Subclass: | 66 | CERAMIC 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: | 501 | COMPOSITIONS: CERAMIC |
| Subclass: | 67 | CERAMIC 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; And zinc or zirconium; |
| Class: | 501 | COMPOSITIONS: CERAMIC |
| Subclass: | 905 | CERAMIC COMPOSITIONS; Optical glass (e.g., silent on refractive index and/or Abbe number); Ultraviolet transmitting or absorbing; |
Known specimens:
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