Spheres obtained by vapor deposition for use in ball point pens
AssigneeUltramet
InventorsRichard B. Kaplan, Sebastian Gonnella
Life of this patent
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Abstract
A sphere particularly suitable for ball point pens having a core capable of withstanding temperature in excess of 800.degree. C. and a chemically vapor deposited coating on the core, the combined diameter of core and coating ranging from approximately 0.5 to approximately 1 mm in diameter. For example, the core may consist of a metal such as tungsten, nickel, copper or molybdenum; or alternatively the core may consist of a ceramic such as aluminum oxide or graphite. The vapor deposited coating may consist of a metal carbide such as tungsten carbide, titanium carbide, tantalum carbide or niobium carbide. Alternatively the coating may consist of a metal boride such as titanium diboride.
Claims19
A ball particularly suitable for a ball point pen and comprising:
- (a) a core consisting of a refractory material capable of withstanding a temperature in excess of 800.degree. C.;
- and
- (b) a coating on said core, said coating being deposited from the vapor phase by hydrogen reduction of a refractory metal halide, said core and coating having a combined diameter of from approximately 0.5 mm to approximately 1 mm and being substantially spherical.
A sphere particularly suitable for a ball point pen comprising:
- (a) a core consisting of tungsten;
- and
- (b) an outer coating consisting of tungsten carbide, said coating being deposited from the vapor phase by the hydrogen reduction of tungsten halide in the presence of a carborizing gas, said ball being substantially spherical and having a diameter between about 0.5 and about 1 mm.
A ball particularly suitable for a ball point pen and comprising:
- (a) a core consisting of a refractory material capable of withstanding a temperature in excess of 800.degree. C.;
- and
- (b) a coating on said core, said coating consisting of a substantially pure refractory metal deposited from the vapor phase by hydrogen reduction of a refractory metal halide, said ball having a diameter between approximately 0.5 and approximately 1 mm and being substantially spherical.
Dependencies are inferred from the claim text.