MAGNET FOR USE IN MAGNETIC THICKNESS GAUGES

• US 3,699,487 A
• Filed: 04/13/1971
• Issued: 10/17/1972
• Est. Priority Date: 11/07/1970
• Status: Expired due to Term

• Current Assignee: Erich Steingroever
• Original Assignee: Erich Steingroever
• Inventors: Steingroever, Erich
• Primary Examiner(s): Harris, George
• Application Number:
  US05/133,600
• Time in Patent Office: 553 Days
• Field of Search: 335/302,304 324/34TK
• US Class Current: 335/302
• CPC Class Codes: G01B 7/105 for measuring thickness of coating

Abstract

A magnet for use in a magnetic gauge for measuring the thickness of a non-magnetic layer on a ferromagnetic base is made of magnetically anisotropic material.

Claims

2. A permanent magnet as defined in claim 1, wherein said permanent magnet body when oriented in said predetermined direction is elongated in said preferred direction of magnetic force.

3. A permanent magnet as defined in claim 2, wherein at least a portion of one end of said elongated permanent magnet body is provided with a hemispherically shaped surface concentric to said preferred direction for said contact with a surface to be measured.

4. A permanent magnet as defined in claim 1, wherein said magnetically anisotropic material basically consists of an aluminum-nickel-cobalt-iron-alloy.

5. A permanent magnet as defined in claim 1, wherein said magnetically anisotropic material basically consists of BaO.6Fe2O3.

6. A permanent magnet as defined in claim 6, wherein the Ba is at least partially substituted by Sr.

7. A permanent magnet as defined in claim 6, wherein the Ba is at least partially substituted by Pb.

8. A permanent magnet as defined in claim 1, wherein said magnetically anisotropic material basically consists of Pt-Co-Fe.

9. A permanent magnet as defined in claim 1, wherein said magnetically anisotropic material basically consists of an alloy of Co with rare earths.