David W. Ewick

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North Granby, CT, US

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Patents Grantslast 30 patents

Information Patent Grant
Initiator with loosely packed ignition charge and method of assembly
- Patent number 6,408,759
- Issue date Jun 25, 2002
- The Ensign-Bickford Company
- David W. Ewick
- C06 - EXPLOSIVES MATCHES
Information Patent Grant
Hybrid electronic detonator delay circuit assembly
- Patent number 5,929,368
- Issue date Jul 27, 1999
- The Ensign-Bickford Company
- David W. Ewick
- F42 - AMMUNITION BLASTING
Information Patent Grant
Detonator with loosely packed ignition charge and method of assembly
- Patent number 5,889,228
- Issue date Mar 30, 1999
- The Ensign-Bickford Company
- David W. Ewick
- C06 - EXPLOSIVES MATCHES
Information Patent Grant
High impedance semiconductor bridge detonator
- Patent number 5,831,203
- Issue date Nov 3, 1998
- The Ensign-Bickford Company
- David W. Ewick
- F42 - AMMUNITION BLASTING
Information Patent Grant
Explosive initiation system
- Patent number 5,714,712
- Issue date Feb 3, 1998
- The Ensign-Bickford Company
- David W. Ewick
- C06 - EXPLOSIVES MATCHES