Composite vacuum evaporation coil

Details Composite vacuum evaporation coil Composite vacuum evaporation coil

1988-03-08

1990-07-03

Boudreau, Leo H.

Electric lamp and discharge devices

Electrode and shield structures

Filament or resistance heated electrodes

313341, 313343, 313345, H01J 116

Patent

active

049394118

ABSTRACT:
A composite vacuum evaporation coil including a base coil and an overwind coil is characterized by the overwind coil being independent of the power source and being confined to the area of the turns of the base coil. Such a composite coil has improved efficiency and operating life.

REFERENCES:
patent: 2306925 (1942-12-01), Aicher
patent: 2329118 (1943-09-01), Inman
patent: 2394474 (1946-02-01), Peters
patent: 2424518 (1947-07-01), Stuart
patent: 2820920 (1958-01-01), Penon
patent: 3531678 (1970-09-01), Schiavone
patent: 3737714 (1973-06-01), Theodosopoulos et al.
patent: 3767959 (1973-10-01), George et al.
patent: 3812393 (1974-05-01), Koo et al.
patent: 4316116 (1982-02-01), Graves et al.
patent: 4355259 (1982-10-01), Weiss
patent: 4661739 (1987-04-01), Dvorak et al.

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