Crucible

Patent metadata

Field	Value
Publication number	US-9527076-B2
Application number	US-201313920600-A
Country	US
Kind code	B2
Filing date	Jun 18, 2013
Priority date	Jun 19, 2012
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

A graphite crucible has a cylindrical body with an upper opening for receiving a sample for analysis and a disk-shaped pedestal base. The pedestal base includes a bottom surface with a centrally formed circular indentation. An inwardly projecting concave arcuate annular indentation extends between the body and pedestal base with a smoothly curved radius of curvature. The upper and lower walls of the arcuate indentation diverge outwardly at an angle of from about 56° to about 60°.

First claim

The invention claimed is:

1. A graphite crucible for use in a resistance analytical furnace comprising:
a generally cylindrical body having a pedestal base and an inwardly concave arcuate annular indentation having a depth of 0.166 inches extending between said body and said base having a smoothly curved radius of curvature of 0.05 inches with upper and lower walls diverging at an angle of from 56° to 60° and wherein said cylindrical body has a cylindrical inner side wall, and said concave floor of said crucible has corners between said inner side wall and said concave floor having a radius of curvature of 0.06 inches; and
wherein said pedestal base is generally disk-shaped, wherein said disk-shaped base has a bottom surface which includes a centrally formed circular indentation with a diameter of 0.19 inches and a depth of 0.056 inches, and wherein said cylindrical body has a concave floor having a radius of curvature of 0.35 inches; and said base has a bottom surface, and said lower wall and said bottom of said base form an angle of from 22°-24°.

2. The crucible as defined in claim 1 wherein the outer diameter of said crucible body is 0.5 inches and the inner diameter of said crucible body is 0.4 inches.

3. The crucible as defined in claim 1 wherein the overall height of said crucible is 1.1 inches.

4. The crucible as defined in claim 1 wherein said pedestal base has a height of 0.06 inches.

Assignees

• Leco Corp

Inventors

• Wetzel Joshua N
• Ford Gordon C

Classifications

• B01L3/04 Primary

  Crucibles · CPC title

• B01L2300/12

  Specific details about materials · CPC title

• F27B14/06

  heated electrically, e.g. induction crucible furnaces with or without any other source of heat (F27B14/04 takes precedence) · CPC title

• F27B14/10

  Crucibles · CPC title

• B01L2300/0851

  Bottom walls · CPC title