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EP 0140330 B1 19890104 - MINIATURE INCANDESCENT LAMP

Title (en)

MINIATURE INCANDESCENT LAMP

Publication

EP 0140330 B1 19890104 (EN)

Application

EP 84112780 A 19841023

Priority

JP 20265383 A 19831031

Abstract (en)

[origin: EP0140330A2] A miniature incandescent lamp of high luminous efficacy and long life has a glass bulb (1) filling an inert gas therein and a coiled filament (2) arranged in the bulb (1), the inert gas containing xenon and nitrogen. A content of xenon in the inert gas is not less than 80% by volume, and a ratio p/d of a coil pitch p of the coiled filament (2) to a wire diameter d is not less than 1.4.

IPC 1-7

H01K 1/14; H01K 1/50

IPC 8 full level

H01K 1/14 (2006.01); H01K 1/50 (2006.01)

CPC (source: EP)

H01K 1/14 (2013.01); H01K 1/50 (2013.01)

Designated contracting state (EPC)

DE FR GB IT NL

DOCDB simple family (publication)

EP 0140330 A2 19850508; EP 0140330 A3 19860122; EP 0140330 B1 19890104; DE 3475989 D1 19890209; GB 8609925 D0 19860529; GB 8613588 D0 19860709; JP H0480504 B2 19921218; JP S6095850 A 19850529

DOCDB simple family (application)

EP 84112780 A 19841023; DE 3475989 T 19841023; GB 8609925 A 19860423; GB 8613588 A 19860604; JP 20265383 A 19831031