# US 9,752,857 B1 · Electric detonator with milled and unmilled DBX-1

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- Number: US 9,752,857 B1
- Document ID: US9752857B1
- Status: Granted
- Kind: B1
- Application number: 15/015,460
- Filed: 2016-02-04
- Granted: 2017-09-05
- Earliest claimed: 2015-07-14
- Assignees: The United States of America as represented by the Secretary of the Army
- Applicants: The United States of America as Represented by the Secretary of the Army
- Inventors: Neha Mehta; Gartung Cheng; Kin Yee; Karl Oyler; Akash Shah; John Marin; John W. Fronabarger; Michael D. Williams; Steven H. Marino; Pamela Tran
- Web page: https://patentgrep.com/patent/US9752857B1

## CPC

- F42B 3/124: {characterised by the configuration or material of the bridge (F42B3/13 takes precedence)}
- F42B 3/128: {characterised by the composition of the pyrotechnic material}
- F42B: EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION (explosive compositions C06B; fuzes F42C; blasting F42D)

## Abstract

Lead free microdet electric detonators comprising a bridgewire having milled DBX-1 as a spot charge and unmilled DBX-1 as the intermediate material. Such improved microdet electric detonator is free of lead azide and lead styphnate, but with comparable stability, power and sensitivity to current lead-based M100 electric detonators.

## Claims

### Claim 1

An electric detonator comprising:
a metal bridgewire having a spot charge composition disposed thereon wherein said spot charge composition comprises milled DBX-1;
an intermediate charge comprising unmilled DBX-1; and
output charge.

### Claim 2 (depends on 1)

The electric detonator of claim 1, wherein the particle size of the milled DBX-1 is about 1 μm to about 28 μm.

### Claim 3 (depends on 1)

The electric detonator of claim 1, wherein the particle size of the milled DBX-1 is about 5 μm to about 1 μm.

### Claim 4 (depends on 1)

The electric detonator of claim 1, wherein the spot charge composition further comprises nitrocellulose and lacquer.

### Claim 5 (depends on 1)

The electric detonator of claim 1, wherein said spot charge composition is a slurry.

### Claim 6 (depends on 1)

The spot charge composition of claim 1, wherein the milled DBX-1 is a single spot charge at about 0.27 mg to about 0.38 mg per header.

### Claim 7 (depends on 1)

The electric detonator of claim 1, wherein the metal bridgewire is selected from the group consisting of nickel chrome, platinum, tungsten, and platinum-iridium.

### Claim 8 (depends on 1)

The electric detonator of claim 1, wherein the bridgewire is nickel chrome.

### Claim 9 (depends on 8)

The bridgewire of claim 8 wherein the diameter of said nickel chrome bridgewire is about 0.00023 inches.

### Claim 10 (depends on 1)

The electric detonator of claim 1, wherein the unmilled DBX-1 is about 12 mg.

### Claim 11 (depends on 1)

The electric detonator of claim 1, wherein the unmilled DBX-1 is loaded at a consolidation pressure of about 8 Kpsi to about 10 Kpsi and the height of the loaded unmilled DBX-1 is about 0.090 to about 0.060 inches.

### Claim 12 (depends on 1)

The electric detonator of claim 1, wherein the output charge is HMX or CL-20.

### Claim 13 (depends on 1)

The electric detonator of claim 1, wherein the output charge is HMX.

### Claim 14 (depends on 1)

The electric detonator of claim 1, wherein the HMX is about 12 mg and loaded at a consolidation pressure of about 12 to about 14 Kpsi and about 0.100 inches to about 0.130 inches in height.

### Claim 15

An electric detonator comprising:
a nickel chrome bridgewire having a spot charge composition disposed thereon and wherein said spot charge composition comprises milled DBX-1, nitrocellulose and lacquer and wherein said spot charge composition is a slurry;
an intermediate charge comprising unmilled DBX-1; and
HMX.