Thrifty-Vent, Inc.

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Salem, IL, US

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Patents Grantslast 30 patents

Information Patent Grant
Venting system for a gas-fired heating plant
- Patent number 4,079,727
- Issue date Mar 21, 1978
- Thrifty-Vent, Inc.
- Donald Leon Smith
- F24 - HEATING RANGES VENTILATING
Information Patent Grant
Venting system for a gas-fired heating plant
- Patent number 4,009,705
- Issue date Mar 1, 1977
- Thrifty-Vent, Inc.
- Donald L. Smith
- F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES