John D. Spencer

Follow

Person

Halifax, CA

People

Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for detecting flame with adjustable optical co...
- Patent number 5,107,128
- Issue date Apr 21, 1992
- Saskatchewan Power Corporation
- Peter W. N. Davall
- G08 - SIGNALLING
Information Patent Grant
Method and apparatus for detecting flame
- Patent number 4,983,853
- Issue date Jan 8, 1991
- Saskatchewan Power Corporation
- Peter W. N. Davall
- G08 - SIGNALLING