Flexible blown fuse indicator
US5821849A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 1997 |
| Grant date | Oct 13, 1998 |
| Priority date | — |
| Expiry date | Jul 17, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H85/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A device for providing a visual indication of the status of a fuse, i.e., whether or not the fuse has blown. The device includes a substrate onto which the elements of the visual indication device are printed. A pair of conductive terminals is screen printed upon that substrate, preferably spaced apart from each other along that substrate. Between the terminals, at least two spaced apart resistance elements are positioned upon the substrate. These two resistance elements are in series with each other, and they are also in series with the pair of conductive terminals. The first of these at least two resistance elements is comprised of a combination of a substance which melts at an elevated temperature, and also of carbon. The second of these at least two resistance elements is comprised solely of carbon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.