Method of fabricating a composite lamp filament

Electric lamp or space discharge component or device manufacturi – Process – Electrode making

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

445 50, H01J 904

Patent

active

050410415

ABSTRACT:
The present invention provides a tungsten-based duplex composite member, e.g., wire or rod, which combines the emissive, nonsag, or other desirable qualities of an inner tungsten-based core material with a different combination of properties, for example, resistance to attack, by the presence of a different tungsten-based material as an outer sheath or shell surrounding the core material.
In one embodiment of the present invention, an electrode is formed from a duplex composite member, composed of a thoriated tungsten core (W-ThO.sub.2) and a thin rhenium (Re) shell.
Other embodiments of duplex composite members are provided by thoriated tungsten discharge electrodes in which it is desirable to have two different concentrations of thoria (ThO.sub.2) in the element, a first concentration in the core of the duplex composite member and a second concentration in the shell or surface of the member.

REFERENCES:
patent: 1123625 (1915-01-01), Thowless
patent: 2269081 (1942-01-01), Felsner
patent: 2488731 (1949-11-01), Lambert et al.
patent: 2524263 (1950-10-01), Kingston
patent: 2842440 (1958-07-01), Nachtman et al.
patent: 2888740 (1959-06-01), Danis
patent: 3168399 (1965-02-01), Takahashi
patent: 3284230 (1966-11-01), Heytmeijer et al.
patent: 3372297 (1968-03-01), Pearsall et al.
patent: 3401297 (1968-09-01), Feinleib
patent: 3537493 (1970-11-01), Hagarman
patent: 3600790 (1971-08-01), Dion
patent: 3777362 (1973-12-01), Nilsson
patent: 3778355 (1973-12-01), Johnson
patent: 3780418 (1973-12-01), Hurst
patent: 3780554 (1973-12-01), Nilsson
patent: 3922769 (1975-12-01), Brenan
patent: 4015765 (1977-04-01), Ahmed
patent: 4105908 (1978-08-01), Harding et al.
patent: 4296352 (1981-10-01), Berlec et al.
patent: 4683397 (1987-07-01), Johnson
Patent Abstracts of Japan, vol. 5, No. 59(E-53), Apr. 22, 1981 & JP-A-56 11832 (Toshiba), Feb. 5, 1981.
Patent Abstracts of Japan, vol. 2, No. 64(E-33), May 17, 1978 & JP-A-53 30266 (Toshiba), Mar. 22, 1978.
Patent Abstracts of Japan, vol. 8, No. 258 (M-340), Nov. 27, 1984, & JP-A-59 130697 (Iwasaki Denki KK), Jul. 27, 1984.
Patent Abstracts of Japan, vol. 6, No. 91 (E-109) (969), May 28, 1982, & JP-A-57 25664 (Mitsubishi Denki K.K.), Feb. 10, 1982.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method of fabricating a composite lamp filament does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of fabricating a composite lamp filament, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of fabricating a composite lamp filament will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1005234

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.