Sylvester L. Steffen

Person

New Hampton, IA, US

People

Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for controlling the drying and cooling of fiel...
- Patent number 4,800,653
- Issue date Jan 31, 1989
- Sylvester L. Steffen
- F26 - DRYING
Information Patent Grant
Pressure reducing exhaust method and structure for ventilated grain...
- Patent number 4,256,029
- Issue date Mar 17, 1981
- Sylvester L. Steffen
- B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
Information Patent Grant
Method for identifying and maintaining a dormancy index in stored g...
- Patent number 4,247,989
- Issue date Feb 3, 1981
- Sylvester L. Steffen
- F26 - DRYING
Information Patent Grant
Temperature monitoring and temperature differential control device
- Patent number 4,175,418
- Issue date Nov 27, 1979
- Steffen; S. L.
- Sylvester L. Steffen
- G01 - MEASURING TESTING
Information Patent Grant
Method for controlling the curing of field-harvested grains with mi...
- Patent number 4,148,147
- Issue date Apr 10, 1979
- Sylvester L. Steffen
- F26 - DRYING
Information Patent Grant
Method and structure for optimizing atmospheric environment to pres...
- Patent number 4,077,134
- Issue date Mar 7, 1978
- Sylvester L. Steffen
- F26 - DRYING
Information Patent Grant
Automatic control for maintaining equilibrium temperature/moisture...
- Patent number 4,053,991
- Issue date Oct 18, 1977
- Sylvester L. Steffen
- A23 - FOODS OR FOODSTUFFS THEIR TREATMENT, NOT COVERED BY OTHER CLASSES
Information Patent Grant
Ventilation process for inducing biochemical reactions in stored fo...
- Patent number 4,045,878
- Issue date Sep 6, 1977
- Sylvester L. Steffen
- B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
Information Patent Grant
Solar grain drying apparatus
- Patent number 4,045,880
- Issue date Sep 6, 1977
- Sylvester L. Steffen
- F24 - HEATING RANGES VENTILATING
Information Patent Grant
Draft inducing roof for storage structures
- Patent number 4,020,565
- Issue date May 3, 1977
- Sylvester L. Steffen
- F26 - DRYING

Sylvester L. Steffen

Person

Patents Grantslast 30 patents

Method and apparatus for controlling the drying and cooling of fiel...

Pressure reducing exhaust method and structure for ventilated grain...

Method for identifying and maintaining a dormancy index in stored g...

Temperature monitoring and temperature differential control device

Method for controlling the curing of field-harvested grains with mi...

Method and structure for optimizing atmospheric environment to pres...

Automatic control for maintaining equilibrium temperature/moisture...

Ventilation process for inducing biochemical reactions in stored fo...

Solar grain drying apparatus

Draft inducing roof for storage structures