Scotophor and method of making same

• US 2,761,846 A
• Filed: 05/28/1952
• Issued: 09/04/1956
• Est. Priority Date: 05/28/1952
• Status: Expired due to Term

• Current Assignee: David B. Medved
• Original Assignee: David B. Medved
• Inventors: Medved, David B.
• Application Number:
  US03/290,617
• Time in Patent Office: 1,560 Days
• US Class Current: 252/301.40F
• CPC Class Codes: C01B 33/2892 containing an element or a compound occluded in the pores of the network, e.g. an oxide already present in the starting reaction mixture
• 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: G03C 1/725 containing inorganic compounds
• CPC Class Codes: H01J 29/14 acting by discoloration, e.g. halide screen

Claims

1. A SCOTOPHOR HAVING THE BASIC CHEMICAL COMPOSITION NA6AL6SI6024 2NAC1 WITH THE CUBIC LATTICE STRUCTURE OF SODALITE, AND CONTAINING ABOUT 1% OF CADMIUM OXIDE SAID SUBSTANCE ASSUMING A MAGENTA TENEBRESCENT DARKENING VISIBLE IN ORDINARY LIGHT UPON EXPOSURE TO RADIATION HAVING A WAVE LENGTH OF 2537 A. WHICH DARKENING IS RETAINED AFTER SAID EXPOSURE, IS REMOVABLE BY HEATING TO 300* C., AND IS AGAIN OBTAINABLE, EVEN AFTER HEATING TO 300* C., UPON EXPOSURE TO RADIATION HAVING A WAVE LENGTH OF 2537 A.

2. THE METHOD OF CONVERTING A NATURAL OR SYNTHETIC SODALITE HAVING THE BASIC CHEMICAL COMPOSITION