Richard William Spraggs

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Simsbury, CT, US

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Patents Grantslast 30 patents

Information Patent Grant
Non-electric signal transmission device connection, method and appa...
- Patent number 5,009,163
- Issue date Apr 23, 1991
- The Ensign-Bickford Company
- Kendall H. Robins
- C06 - EXPLOSIVES MATCHES
Information Patent Grant
Non-electric double delay borehole downline unit for blasting opera...
- Patent number 3,987,732
- Issue date Oct 26, 1976
- The Ensign-Bickford Company
- Richard William Spraggs
- C06 - EXPLOSIVES MATCHES
Information Patent Grant
Millisecond delay surface connector
- Patent number 3,987,733
- Issue date Oct 26, 1976
- The Ensign-Bickford Company
- Richard William Spraggs
- F42 - AMMUNITION BLASTING