Screen material

• US 2,752,521 A
• Filed: 04/09/1953
• Issued: 06/26/1956
• Est. Priority Date: 04/09/1953
• Status: Expired due to Term

• Current Assignee: Henry F. Ivey
• Original Assignee: Henry F. Ivey
• Inventors: Ivey, Henry F.
• Application Number:
  US03/347,729
• Time in Patent Office: 1,174 Days
• US Class Current: 313/465
• CPC Class Codes: C09K 9/00 Tenebrescent materials, i.e. materials for which the range of wavelengths for energy absorption is changed as a result of excitation by some form of energy
• CPC Class Codes: H01J 29/14 acting by discoloration, e.g. halide screen

Claims

1. A CATHODE RAY DEVICE HAVING AN IMAGE SCREEN COMPRISING M'"'"''"'"'2O, AL2O3, SIO2, AND MX WHERE M AND M'"'"''"'"' STAND FOR AN ALKALI METAL AND X IS A HALOGEN.

2. A CATHODE RAY DEVICE HAVING AN IMAGE SCREEN OF NATURAL HACKMANITE.