Patent information:
| Patent: | Utility 1,449,793 |
| Patented: | March 27, 1923 |
| Applied: | November 29, 1920 |
| Title: | Glass and Process of Making Same |
| Description: | Boro-silicate glass made colorless by adding neodymium oxide |
| Category: | Boron |
| Assigned to: | Corning Glass Works |
Patentee Information:
Class and subclass information:
| Class: | 501 | COMPOSITIONS: CERAMIC |
| Subclass: | 61 | 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 lead; And boron; |
| Class: | 313 | ELECTRIC LAMP AND DISCHARGE DEVICES |
| Subclass: | 112 | WITH OPTICAL DEVICE OR SPECIAL RAY TRANSMISSIVE ENVELOPE; Polarizer or special ray transmission (e.g., filter); |
| Class: | 313 | ELECTRIC LAMP AND DISCHARGE DEVICES |
| Subclass: | 636 | WITH GAS OR VAPOR; Envelope composition; |
| Class: | 501 | COMPOSITIONS: CERAMIC |
| Subclass: | 64 | 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 yttrium or rare earth (i.e., elements with atomic numbers 39 or 57-71); |
| Class: | 501 | COMPOSITIONS: CERAMIC |
| Subclass: | 65 | 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; |
Known specimens:
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