Method to produce large, uniform hollow spherical shells
US4548767A · kind A · utility
51Cited by
16References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 26, 1983 |
| Grant date | Oct 22, 1985 |
| Priority date | — |
| Expiry date | Sep 26, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S376/916
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Large, uniform hollow spherical shells are produced by forming uniform size drops of heat decomposable or vaporizable material, evaporating the drops to form dried particles, coating the dried particles with a layer of shell forming material, and heating the composite particles to melt the outer layer and decompose or vaporize the inner particle to form an expanding inner gas bubble which expands the outer layer. By cycling the temperature and pressure on the hollow shells, spherical shells with uniform walls are produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.