Charlie J. Schafer

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Panora, IA, US

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Patents Grantslast 30 patents

Information Patent Grant
Groundwater control system and method
- Patent number 8,403,596
- Issue date Mar 26, 2013
- Charlie J. Schafer
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Groundwater control system with purity sensor and method
- Patent number 8,342,775
- Issue date Jan 1, 2013
- Agri Drain Corporation
- Charlie J. Schafer
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Drainage tile flow regulator
- Patent number 6,786,234
- Issue date Sep 7, 2004
- Agri Drain Corporation
- Charlie J. Schafer
- A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING
Information Patent Grant
Drainage tile flow regulator
- Patent number 6,715,508
- Issue date Apr 6, 2004
- Agri Drain Corporation
- Charlie J. Schafer
- A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING
Information Patent Grant
Corrugated pipe connection stabilizing apparatus
- Patent number 6,672,626
- Issue date Jan 6, 2004
- Agri Drain Corporation
- Charlie J. Schafer
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...

Patents Applicationslast 30 patents

Information Patent Application
Groundwater control system with purity sensor and method
- Publication number 20060013652
- Publication date Jan 19, 2006
- Agri Drain Corporation
- Charlie J. Schafer
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Application
Groundwater control system and method
- Publication number 20060002763
- Publication date Jan 5, 2006
- Charlie J. Schafer
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Application
DRAINAGE TILE FLOW REGULATOR
- Publication number 20040144432
- Publication date Jul 29, 2004
- Charlie J. Schafer
- A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING
Information Patent Application
Drainage tile flow regulator
- Publication number 20030226599
- Publication date Dec 11, 2003
- Charlie J. Schafer
- A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING