Method for making continuous and closed hollow bodies, hollow bodies so obtained and apparatus for making the hollow spheres
US4722770A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jul 24, 1986 |
| Grant date | Feb 2, 1988 |
| Priority date | — |
| Expiry date | Jul 24, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D1/02
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for manufacturing continuous, closed and hollow bodies which comprises (a) using cores (25) which are soluble in a solvent, (b) depositing on each core a coating (3) with a suitable mechanical strength to be self-supporting and having open pores to pass a solvent, and (c) placing the cores so coated into a solvent for dissolving the cores; the method of the invention may be implemented in bulk parts, in an economical manner, and allows making hollow bodies, in particular hollow balls, each comprising a continuous skin devoid of any macroscopic perforation and of a kind and with a thickness which are easily adjusted in relation to the desired properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.