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Manthei; Benjamin R.
Petoskey, MI
No. of patents:

Patent Number Title Of Patent Date Issued
D486246 Concrete cap for a wall February 3, 2004
D477419 Face for a concrete wall block July 15, 2003
D477091 Face for a concrete wall block July 8, 2003
8268223 Form and process for casting concrete blocks September 18, 2012
A form and process for casting concrete blocks, each having at least one side textured. The blocks are cast in cavities which have a resilient insert on at least one side for imparting texture to the blocks. After the cast blocks are cured, the form is inverted and placed on a support
6997427 Form for casting concrete block column February 14, 2006
A form for casting concrete columns which simulate a stack of stone blocks. The form includes first and second side sections, each including two side panels. The side sections are releasably connected together to form a rectangular frame which has closed and open positions. The frame
6955015 System for interconnecting wall blocks October 18, 2005
A wall is constructed from precast concrete blocks stacked in tiers in which adjacent blocks are secured together to increase the strength of the wall. Anchors are embedded in the tops of at least some of the blocks. The ends of the blocks have vertical grooves which form a vertical open
6854702 Form for manufacturing concrete blocks for freestanding walls February 15, 2005
A form for manufacturing concrete blocks for constructing freestanding walls. The form includes a base and four side panels which are mounted on the base to pivot between a first position for casting a block and a second position for removing a cast block from the form. An insert is
6835343 Method for handling concrete retaining wall blocks December 28, 2004
A method and apparatus for handling large concrete retaining wall blocks and the like. The blocks are cast in a form with the front face down, a lifting loop extending from a rear face and with grooves extending in sides from a rear face to adjacent the front face. A spear hook is secure
6715965 Retaining wall blocks and retaining walls constructed from such blocks April 6, 2004
Retaining walls are formed from one or more tiers of concrete blocks. Top projections on all except the uppermost tier of blocks are received in recesses in the bottom of blocks in an adjacent upper tier. The top of the retaining wall may be finished with blocks which have a surface port
6679656 Connection for geogrid to concrete block earth retaining walls January 20, 2004
A connection for securing a geogrid fabric to between two tiers of concrete blocks which are stacked to form an earth retaining wall. A groove is formed in the top of each block in the lower tier to extend across the width of each block substantially parallel to the face of the block. Th

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