Two-way-burning sparkler and method of manufacture
US6718882B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 31, 2002 |
| Grant date | Apr 13, 2004 |
| Priority date | — |
| Expiry date | Oct 31, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF42B4/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A sparkler for use as a fireworks display is provided. The sparkler has an extended spark display time, burning and emitting sparks in one direction initially followed by the spark progression reversing direction and then burning while emitting sparks in the reverse direction. The sparkler construction provides inner and outer sheaths of a flammable spark composition separated by an insulating layer of a fire resistant material. The inner and outer layers are in contact with one another at one end of the sheath, to permit ignition of the inner flammable composition by the progressing spark. Especially preferred is a construction of the aforesaid sparkler which emits sparks of one color upon the initial burn and sparks of a different color upon the reverse burn. Also provided is a process for the manufacture of these novel sparklers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.