Magnetic coating thickness comparator having parallel magnetic rods with nonmagnetic slide indicators
US4433290A · kind A · utility
7Cited by
8References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 7, 1983 |
| Grant date | Feb 21, 1984 |
| Priority date | — |
| Expiry date | Jul 7, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B7/34
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A coating thickness and surface comparator for measuring the thickness of nonmagnetic coatings (28) or roughness on ferromagnetic base materials. A permanent rod magnet (6) and a ferromagnetic rod (16) are supported by nonmagnetic slides (12, 14) parallel to one another. When a standard base (24) is placed at one end (22) of the rod magnet (6) and a coated or roughened base (30) is placed at the other end, the slides (12, 14) are pushed together toward the middle of the rod magnet (6). The coincidence of the slides (12, 14) varies from the middle of the bar magnet (6) in proportion to coating thickness (28) or roughness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.