Copper wires used for transmitting sounds or images
US4792369A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1987 |
| Grant date | Dec 20, 1988 |
| Priority date | — |
| Expiry date | Jul 30, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC30B29/02
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The present invention relates to a copper wire for use in sound or image reproducing systems, such as audio, video and television systems, etc., and a method for manufacturing the same. The copper wire consists of high purity copper in which silver and sulfur contents are both not more than 0.5 ppm and preferably has a crystal grain size not less than 0.02 mm and is unidirectionally solidified or single crystallized. Such a copper wire is manufactured by continuously casting electrodeposited copper which has been obtained by refining by re-electrolysis of electrolytic copper, using a specially arranged casting apparatus having a mold projecting to an electrolytic bath.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.