Fingerprinting crystals
US4143544A · kind A · utility
7Cited by
2References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 22, 1977 |
| Grant date | Mar 13, 1979 |
| Priority date | — |
| Expiry date | Jun 22, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/60
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A diamond or cubic boron nitride crystal containing growth discontinuities resulting from changes in the environment of the growing crystal and having at least one smooth outside surface which intersects the growth discontinuities is charged electrostatically, a fine powder is applied to the charged smooth surface and the applied powder produces a pattern on the charged surface which is a delineation of the intersected growth discontinuities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.