Method for making a preform doped with a metal oxide
US5203897A · kind A · utility
8Cited by
13References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1992 |
| Grant date | Apr 20, 1993 |
| Priority date | — |
| Expiry date | Mar 24, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B2207/36
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An improved method for making preforms by vapor deposition soot laydown processes is provided wherein an oxidizing atmosphere is used during at least part of the laydown process, e.g., during the laydown of the center portion of the preform. The use of such an atmosphere has been found to result in enhanced dopant capture, reduced axial trends, and an overall stabilization of the laydown process. A method for selecting burner flows which optimize the laydown process is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.