Method for investigating the formation of crystals in a transparent material
US4711697A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1985 |
| Grant date | Dec 8, 1987 |
| Priority date | — |
| Expiry date | Nov 21, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC30B11/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of observing crystal formation in a transparent specimen (58 of FIG. 5) comprising the steps of melting a portion of the specimen in a heating zone (22 of FIG. 2) freezing the melted portion of the specimen 58 by a cooling zone (20 of FIG. 2) spaced from the heating zone by a gap (42) which is observable by a suitable observing means (30), controlling the temperatures of the heating and cooling zones (22 and 20) to various temperatures to create a variable temperature gradient across the gap (42) so that the freezing isotherm of the specimen (58) always remains in a substantially constant position within the gap (42) where it is observable by the observing means (30), and moving the specimen (58) longitudinally while the temperature gradient is varying.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.