Cathode for cathode ray tube with improved lifetime

Details Cathode for cathode ray tube with improved lifetime Cathode for cathode ray tube with improved lifetime

2008-05-13

2008-05-13

Williams, Joseph L. (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Shaped electrode chamber, insulator end, shell skirt, baffle...

C313S34600R, C313S3460DC

Reexamination Certificate

active

10498045

ABSTRACT:
Impregnated cathode for a vacuum tube comprising an emissive part in the form of a porous pellet impregnated with a compound of alkaline earth metals; the pellet is placed in a dish made of a refractory material and covered with a porous metal foil forming the emissive surface of the cathode. Moreover, the pellet has a separation surface between a heavily impregnated zone and a zone which is not impregnated or weakly impregnated so that the said separation surface comprises at least a hollow part facing the emissive surface. By virtue of the shape of this separation surface, the lifetime of the cathode is improved.

REFERENCES:
patent: 4101800 (1978-07-01), Thomas et al.
patent: 4494035 (1985-01-01), Palluel et al.
patent: 4837480 (1989-06-01), Breeze et al.
patent: 6016026 (2000-01-01), Lee
patent: 6252341 (2001-06-01), Hasegawa et al.
patent: 57-115739 (1982-07-01), None
Patent Abstracts of Japan, vol. 006, No. 211, Oct. 23, 1982 & JP 57-115739 (See Reference AD).
Search Report Dated Feb. 6, 2003.

Affiliated with

Also associated with

Rating

Cathode for cathode ray tube with improved lifetime does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cathode for cathode ray tube with improved lifetime, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cathode for cathode ray tube with improved lifetime will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3927733