Use of hot buoyant liquid to convert pitch to continuous carbon filament
US3972968A · kind A · utility
4Cited by
6References
28Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1974 |
| Grant date | Aug 3, 1976 |
| Priority date | — |
| Expiry date | Nov 21, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/19
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Suitable pitch is formed into a filament continuously and upward by various means located at the bottom of a vessel containing a hot buoyant liquid. The liquid buoys up the fragile filament as it ascends the vessel from a lower region held at one temperature to an upper region where the temperature is about 450.degree.-700.degree.C. The filament emerges upward out of the liquid to move further through a still higher temperature (>900.degree.C) zone which upon leaving the previously formed pitch is a carbon filament. The liquid can be a blend of suitable molten inorganic salts or a molten inorganic oxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.