Thermoset heating composition including high efficiency heating agents and methods of use
US6677559B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Jun 24, 2002 |
| Grant date | Jan 13, 2004 |
| Priority date | — |
| Expiry date | Jun 24, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/2598
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Thermoset heating compositions for use in alternating magnetic fields include fiber based heating agents which have remarkably and unexpectedly high heating efficiencies. The fibers operate efficiently at lower field intensities; at lower frequencies and with smaller diameters (related to skin depths) than prior art technologies. The fibers may be formed from a variety of ferromagnetic materials, including, for example: iron, nickel, cobalt, chromium and alloys thereof. The preferred materials group is: carbon steel, magnetic stainless steel, nickel, ferromagnetic coated electrically conductive materials, ferromagnetic coated electrically nonconductive materials. The fibers are sized, in accordance with skin effect theory, to heat effectively at a frequency substantially higher that the actual frequency to be utilized. The fibers have lower apparent density and/or smaller diameters and/or higher surface areas and/or substantially higher heating efficiency than powder of the same ferromagnetic composition for operation at a given frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.