David P. Welden

Person

Iowa Falls, IA, US

People

Patents Grantslast 30 patents

Information Patent Grant
High efficiency hydronic heat system
- Patent number 6,820,818
- Issue date Nov 23, 2004
- David P. Welden
- F24 - HEATING RANGES VENTILATING
Information Patent Grant
Variable heat output burner assembly
- Patent number 6,733,278
- Issue date May 11, 2004
- David P. Welden
- F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
Information Patent Grant
Dual regulator direct-fired steam generator
- Patent number 6,135,063
- Issue date Oct 24, 2000
- David P. Welden
- F22 - STEAM GENERATION
Information Patent Grant
Dual heat source heating system
- Patent number 5,775,581
- Issue date Jul 7, 1998
- David P. Welden
- F24 - HEATING RANGES VENTILATING
Information Patent Grant
Direct fired hot water generator with more than one heat exchange zone
- Patent number 5,368,474
- Issue date Nov 29, 1994
- David P. Welden
- F24 - HEATING RANGES VENTILATING
Information Patent Grant
Direct fired hot water generator with more than one heat exchange zone
- Patent number 5,305,735
- Issue date Apr 26, 1994
- David P. Welden
- F24 - HEATING RANGES VENTILATING
Information Patent Grant
Multiple burner control apparatus
- Patent number 4,614,491
- Issue date Sep 30, 1986
- David P. Welden
- F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
Information Patent Grant
Variable stage direct field boiler
- Patent number 4,462,342
- Issue date Jul 31, 1984
- David P. Welden
- F22 - STEAM GENERATION
Information Patent Grant
Heating apparatus
- Patent number 4,354,481
- Issue date Oct 19, 1982
- David P. Welden
- F24 - HEATING RANGES VENTILATING
Information Patent Grant
Concrete forming and curing apparatus
- Patent number 4,147,323
- Issue date Apr 3, 1979
- David P. Welden
- B28 - WORKING CEMENT, CLAY, OR STONE

David P. Welden

Person

Patents Grantslast 30 patents

High efficiency hydronic heat system

Variable heat output burner assembly

Dual regulator direct-fired steam generator

Dual heat source heating system

Direct fired hot water generator with more than one heat exchange zone

Direct fired hot water generator with more than one heat exchange zone

Multiple burner control apparatus

Variable stage direct field boiler

Heating apparatus

Concrete forming and curing apparatus