Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1977-01-24
1982-07-27
Fisher, Richard V.
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
65 312, 65 32, 427163, 427231, 427237, C03B 37025, C03B 37075
Patent
active
043414419
ABSTRACT:
An optical glass fiber is formed of an inner layer of germania doped glass within the bore of the outer cladding tube of silica. The tube with the higher index of refraction inner layer is rotated while being heated to collapse the bore to form an optical fiber preform. The preform is then drawn into fiber in a separate operation. A first silica layer can be deposited within the tube bore before the germania doped layer. The deposition of germania takes place under hydrogen free conditions. Appropriate heat treatment of the tube avoids excessive evaporation of germania and provides a graded transition of the refractive index in the boundary between core and cladding.
REFERENCES:
patent: 3711262 (1973-01-01), Keck et al.
patent: 3737292 (1973-06-01), Keck et al.
patent: 3823995 (1974-07-01), Carpenter
patent: 3884550 (1975-05-01), Maurer et al.
patent: 3961926 (1976-06-01), Asam
Stecher, Editor, The Merck Index of Chemicals and Drugs, published by Merck and Co. Inc., Rahway, N.J., 1960, p. 934.
Black Philip W.
Irven John
Lighty Paul E.
Fisher Richard V.
International Standard Electric Corp.
O'Halloran John T.
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