Closed-loop tubular lamp envelope and method of manufacture

Details Closed-loop tubular lamp envelope and method of manufacture Closed-loop tubular lamp envelope and method of manufacture

1996-05-22

1998-03-03

Moy, Joseph M.

Receptacles

Envelope for electric lamp or similar device

Tv tube

445 23, H01J 938

Patent

active

057225494

ABSTRACT:
A closed-loop, tubular lamp envelope and methods of manufacturing closed-loop, tubular lamp envelopes are disclosed. A dome is formed at one end of a light-transmissive tube. A blister is molded on the dome, and a hole is formed in the molded blister. Next, a dome is formed at the other end of the light-transmissive tube. A blister is formed on the dome, and a second hole is formed in the molded blister. Each of the molded blisters includes a rim which defines the respective hole. A second tube is processed in the same way. The respective rims at the ends of the first and second tubes are fused together to form a sealed, closed-loop lamp envelope. Each tube may be bent to provide a desired shape of the lamp envelope. The molding of the rims insures that the sealing surfaces match.

REFERENCES:
patent: 3451579 (1969-06-01), Bishop
patent: 3500118 (1970-03-01), Anderson
patent: 3987334 (1976-10-01), Anderson
patent: 4027363 (1977-06-01), Belknap
patent: 4160186 (1979-07-01), Kerekes
patent: 4787865 (1988-11-01), Livzra et al.
patent: 4850500 (1989-07-01), White et al.
patent: 5557170 (1996-09-01), Ooms

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