Photosensitively opacifiable glass

• US 2,684,911 A
• Filed: 08/30/1951
• Issued: 07/27/1954
• Est. Priority Date: 08/30/1951
• Status: Expired due to Term

• Current Assignee: Donald Stookey Stanley
• Original Assignee: Donald Stookey Stanley
• Inventors: DONALD STOOKEY STANLEY
• Application Number:
  US03/244,478
• Time in Patent Office: 1,062 Days
• US Class Current: 501/32
• CPC Class Codes: C03C 14/006 the non-glass component being in the form of microcrystallites, e.g. of optically or electrically active material
• CPC Class Codes: C03C 15/00 Surface treatment of glass, not in the form of fibres or filaments, by etching etching or surface-brightening compositions, in general C09K13/00
• CPC Class Codes: C03C 3/076 with 40% to 90% silica, by weight C03C3/045 takes precedence
• CPC Class Codes: C03C 4/02 for coloured glass
• CPC Class Codes: C03C 4/04 for photosensitive glass
• CPC Class Codes: G03C 1/494 Silver salt compositions other than silver halide emulsions; Photothermographic systems ; Thermographic systems using noble metal compounds

Claims

1. A REDUCED GLASS COMPRISING ESSENTIALLY 70-85% SIO2, 9-15% LI2O, THE INDICATED PROPORTION OF AT LEAST ONE ALKALI METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF UP TO 8% NA2O, UP TO 8% K2O AND UP TO 8% OF A MIXTURE OF NA2O AND K2O, THE TOTAL ALKALI METAL OXIDE CONTENT BEING 9% TO 23%, AND 0.001% TO 0.020% OF SILVER COMPUTED AS AGCL, THE ESSENTIAL CONSTITUENTS TOTALING AT LEAST 84%, SAID GLASS BEING PHOTOSENSITIVELY OPACIFIABLE.