Protection device for basalt drain bushings
US4565559A · kind A · utility
7Cited by
8References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 13, 1984 |
| Grant date | Jan 21, 1986 |
| Priority date | — |
| Expiry date | Nov 13, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B37/083
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention relates to a method of retarding bushing degradation by glass batch containing iron oxide. The problem is solved by substantially eliminating the passage of current directly through the bushing for heating and employing a conductive heating means to an electrically insulated bushing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.