Eric A. Ditcher

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Cornwells Heights, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for lining manhole assemblies and the like
- Patent number 4,751,799
- Issue date Jun 21, 1988
- A-LOK Product, Inc.
- Jack Ditcher
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
Method of making a manhole riser having integral flexible waterlock...
- Patent number 4,737,220
- Issue date Apr 12, 1988
- A-Lok Products, Inc.
- Jack Ditcher
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Manhole riser having integral flexible waterlock for manhole covers...
- Patent number 4,621,941
- Issue date Nov 11, 1986
- A-Lok Products, Inc.
- Jack Ditcher
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Manhole riser and cooperating sleeve to provide a waterlock for man...
- Patent number 4,540,310
- Issue date Sep 10, 1985
- A-Lok Products, Inc.
- Jack Ditcher
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING