Karl H. Kahl

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Chelmsford, MA, US

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Patents Grantslast 30 patents

Information Patent Grant
Dual sequence solar water heater
- Patent number 4,898,152
- Issue date Feb 6, 1990
- Karl H. Kahl
- F24 - HEATING RANGES VENTILATING
Information Patent Grant
Low cost, low pressure, solar heated fence surrounding a swimming pool
- Patent number 4,381,763
- Issue date May 3, 1983
- Karl H. Kahl
- F24 - HEATING RANGES VENTILATING