Douglas A. Bonfield

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St. Charles, IL, US

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Patents Grantslast 30 patents

Information Patent Grant
Device for regulating speed of deployment of sprinkler heads in pre...
- Patent number 6,216,963
- Issue date Apr 17, 2001
- The Curran Company
- Douglas A. Bonfield
- A62 - LIFE-SAVING FIRE-FIGHTING
Information Patent Grant
Device for regulating speed of deployment of sprinkler heads in pre...
- Patent number 5,921,322
- Issue date Jul 13, 1999
- The Curran Company
- Douglas A. Bonfield
- A62 - LIFE-SAVING FIRE-FIGHTING