Electric lamp having a pressure molded base

Details Electric lamp having a pressure molded base Electric lamp having a pressure molded base

1990-09-21

1992-04-14

Yusko, Donald J.

Electric lamp and discharge devices

With envelope

Having base and connector

445 22, H01J 548

Patent

active

051051192

ABSTRACT:
An electric lamp having a light transmissive envelope enclosing a light source, a circumferential mold-sealing member disposed on an end portion of said envelope, and a lamp base of synthetic material pressure molded onto the mold-sealing member and the envelope end portion. The mold-sealing member provides an effective seal with the corresponding edge of a base mold, allowing the base to be molded directly onto the lamp envelope. For envelopes sealed by a pinch or wedge press, the mold-sealing member is a circumferential ring and for stem-sealed lamps the mold-sealing member is a sealing cap which closes the stem cavity.

REFERENCES:
patent: 3413511 (1968-11-01), Plagge
patent: 4547838 (1985-10-01), Wakimizu
patent: 4570104 (1986-02-01), Janssen
patent: 4864184 (1989-09-01), Flemming
patent: 4970428 (1990-11-01), Hayakawa

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