US 12,460,281 B2
Tungsten-containing material and direct current discharge lamp electrode
Hidenobu Nishino, Toyama (JP)
Assigned to A.L.M.T. Corp., Tokyo (JP)
Appl. No. 18/854,332
Filed by A.L.M.T. Corp., Tokyo (JP)
PCT Filed Apr. 11, 2023, PCT No. PCT/JP2023/014759
§ 371(c)(1), (2) Date Oct. 4, 2024,
PCT Pub. No. WO2023/199921, PCT Pub. Date Oct. 19, 2023.
Claims priority of application No. 2022-067481 (JP), filed on Apr. 15, 2022.
Prior Publication US 2025/0223674 A1, Jul. 10, 2025
Int. Cl. C22C 27/04 (2006.01); H01J 61/06 (2006.01); H01J 61/073 (2006.01)
CPC C22C 27/04 (2013.01) [H01J 61/06 (2013.01); H01J 61/0732 (2013.01); H01J 61/0735 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A tungsten-containing material that has an oxygen generation quantity of more than 1 ppm and 20 ppm or less at 2100° C. to 2300° C. as detected by oxygen analysis based on an oxygen separation method, and contains 5 ppm or more and 30 ppm or less of potassium.