Method for the production of cylindrically symmetric bodies with a radial gradient
US4986939A · kind A · utility
16Cited by
20References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 20, 1987 |
| Grant date | Jan 22, 1991 |
| Priority date | — |
| Expiry date | May 20, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/0612
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In a method for the production of cylindrically symmetric bodies with given radial gradient of the material properties, for example of the refractive index, at least two rod-shaped molded bodies consisting of materials with different properties are joined in parallel and, following lowering of the viscosity of both materials, the bodies are twisted many times in a spiral around a longitudinal axis, such that a desired radial gradient of the material properties arises, where metallic, semiconducting, or insulating materials may be used, and the viscosity is varied through changing the temperature or adding or removing a solvent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.