Larry D Kunkler

US Patent:

44904088, Dec 25, 1984

Filed:

Mar 14, 1983

Appl. No.:

6/474753

Inventors:

Robert R. Zimmerman - Beaverton OR
Larry D. Kunkler - Beaverton OR
Earl R. Helderman - Hillsboro OR

Assignee:

Tektronix, Inc. - Beaverton OR

International Classification:

B05D 306
B05B 502

US Classification:

427 42

Abstract:

A coating of metallic material is deposited on the internal surface of a hollow object. An elongate member comprising two electrical conductors extending side-by-side from end-to-end of the member has one end inside the hollow object and its opposite end outside the object. A filament has its two ends connected to the conductors respectively at the one end of the elongate member, and a crucible containing metal to be deposited is supported above the filament and in spaced relationship thereto. By supplying current to the filament by way of the conductors for the filament is heated to achieve thermonic emission. The filament and the crucible are connected to negative and positive terminals respectively of a potential source so that electrons emitted by the filament are accelerated towards the crucible and cause the crucible to be heated by electron bombardment.