Non-toxic rim-fire primer
US5610367A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1995 |
| Grant date | Mar 11, 1997 |
| Priority date | — |
| Expiry date | Oct 6, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC06B35/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A lead-free rim-fire primer mix which utilizes cupric azide, a highly sensitive chemical, as the primary explosive in lieu of lead styphnate. The cupric azide is mixed with carefully selected proportions of nitrocellulose, tetracene, fine particles of ground glass and a binder, typically gum tragacanth. When mixed in the proper proportions, this mix has the required sensitivity, stability, and non-hygroscopicity for regular commercial rim-fire ammunition. The tetracene is not required as a sensitizer, but is used as an ignition aid. The preferred range of percentages are 10-36% by weight of cupric azide, 5-10% by weight of tetracene, 15-30% by weight of nitrocellulose, 20-50% by weight of glass, and 1-2% by weight of a suitable gum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.