Incandescent lamp

Details Incandescent lamp Incandescent lamp

1979-12-19

1981-10-20

Chatmon, Jr., Saxfield

Electric lamp and discharge devices

Incandescent lamps

313341, 313345, 427111, H01K 142, H01K 708

Patent

active

042963524

ABSTRACT:
An improved incandescent lamp filament is described having an inner core of doped tungsten crystals with a surface layer of chemically vapor deposited undoped tungsten crystals. The inner core material exhibits the sag-resistant grain structure obtained with dispersion alloy products of tungsten whereas the unalloyed tungsten crystals in the surface layer are of a finer size and can further exhibit a preferred crystallographic orientation. Incandescent lamps utilizing said improved tungsten filaments exhibit increased vibration resistance and greater notch resistance when operated on direct current.

REFERENCES:
patent: 1123625 (1915-01-01), Thowless
patent: 1149701 (1916-04-01), Thowless
patent: 1410499 (1922-03-01), Pacz
patent: 2225239 (1940-12-01), Spaeth
patent: 3075120 (1963-01-01), Schnitzel
patent: 3798490 (1974-03-01), Ackerman et al.
patent: 3811936 (1974-05-01), Archer et al.

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