William D Lockwood
Engineers at Research Blvd, Dayton, OH

4797030, Jan 10, 1989

Aug 17, 1987

7/086064

William D. Lockwood - Dayton OH

Con/Span Culvert Systems, Inc. - Dayton OH

E01F 500

405125

A precast concrete culvert system includes a series of open bottom culvert sections each having parallel spaced vertical side walls integrally connected to an arcuate top wall having a curved inner surface with a radius of curvature at least twice the rise defined between the top center of the curved inner surface and the bottom surfaces of the side walls. The side walls rest on footers and have outer surfaces which form sharp corners with the top surface of the top wall and have a vertical height at least sixty percent and preferably between eighty and ninety percent of the rise. The vertical height is also less than fifty percent of the radius of curvature which is between twenty and fifty feet and preferably either about twenty-five or forty feet. The end sections have vertical head walls, and the vertical side walls are adapted to connect with angularly disposed vertical concrete wing walls to provide for a smooth hydraulic flow into and through the series of the culvert sections. Culvert sections may also be formed to form a curved conduit or an underground tank.

2014003, Feb 6, 2014

Aug 2, 2013

13/957596

James D. Lockwood - Boulder CO, US
William D. Lockwood - Dayton OH, US

F03D 11/04, E04H 12/16

522235

A post-tensioned precast segmental concrete tower has a stack of annular segments with uniform cross-sections which varies over the tower height. The transition between tower segments occurs in stages and is achieved using annular members or segments which support and anchor post-tensioning tendons that transfer loads passing through the tower as a result of a change in tower geometry. The tower segments are match cast against one another in fabrication to create tight matching opposing surfaces when placed into the tower and to create tight joints. The match casting eliminates the need for grout between precast segments, resulting in a faster tower erection time and high durability of the joints. All annular segments have horizontal joints and no vertical joints. The tower geometry simplifies the formwork system used to precast the segments, and the post-tensioning tendons tie all segments together and to the foundation.

5894003, Apr 13, 1999

Jul 1, 1997

8/886481

William D. Lockwood - Dayton OH

B32B 3500, E04B 116

264 3619

Parallel spaced grooves are cut within the surface of an existing reinforced concrete member in the direction of bending and at locations where existing tensile reinforcing is inadequate. Elongated reinforcing elements, such as composite rods with continuous carbon fibers, are positioned within the grooves, after a curable bonding material, such as an epoxy resin, is inserted into each groove so that the bonding material surrounds the reinforcing element. The material is formed flush with the surface and allowed to cure to bond each reinforcing element to the concrete defining the corresponding groove. The grooves and reinforcing elements extend within the top surface of a concrete slab across a beam or support for the slab, extend within the bottom surface of the slab at least fifty percent of the distance between adjacent supports for the slab, or within a vertical surface of a concrete or masonry wall or column.

2007026, Nov 15, 2007

Jun 14, 2007

11/818386

William Lockwood - Dayton OH, US
David Brodowski - Beavercreek OH, US

E04B 1/16

052380000

A one-piece open bottom fiber reinforced precast concrete arch unit is buried in compacted soil and has an arcuate top wall portion integrally connecting arcuate side wall portions. The fiber reinforced wall portions have a configuration which provides ductility and flexure strength for effectively utilizing the surrounding compacted soil to resist deflection of the unit in response to a load and to redistribute stresses in the unit. Each of the side wall portions of the unit has a reducing wall thickness towards its bottom and has a radius of curvature greater than the rise of the unit and at least twice the radius of curvature of the top wall portion. A fiber reinforced end arch unit includes an integrally precast and fiber reinforced vertical collar connected to fiber reinforced wing walls by bolts extending through the collar and into anchor nuts embedded in the wing walls.

D469021, Mar 16, 1999

Jul 28, 1997

D/074683

William D. Lockwood - Dayton OH

Con/Span Bridge Systems, Inc. - Dayton OH

2503

D25 1

D573722, Jul 22, 2008

Mar 28, 2007

29/285322

William D. Lockwood - Dayton OH, US

Contech Bridge Solutions Inc. - West Chester OH

2504

D25 62

4687371, Aug 18, 1987

Apr 17, 1986

6/853206

William D. Lockwood - Dayton OH

Con/Span Culvert Systems, Inc. - Kettering OH

E01F 500

405125

A culvert section includes vertical parallel spaced concrete side walls integrally connected by an arcuate concrete top wall having a curved inner surface with a radius of curvature at least twice the rise defined between the top center of the curved inner surface and the bottom surfaces of the side walls. The side walls have flat outer surfaces which form corners with the top surface and have a vertical height preferably between eighty and ninety percent of the rise. The vertical height is also less than fifty percent of the radius of curvature which is between twenty and thirty feet and preferably about twenty-five feet. The vertical side walls are adapted to connect with angularly disposed vertical concrete wing walls to provide for a smooth hydraulic flow into and through a series of the culvert sections.

7001110, Feb 21, 2006

Mar 1, 2004

10/790491

William D. Lockwood - Dayton OH, US

Con/Span Bridge Systems Ltd. - Dayton OH

E02D 5/74

405284, 52295, 52610

A precast concrete retaining wall forms a wing wall for a precast concrete culvert unit and is supported by a concrete footer with one or more precast anchor member projecting laterally from the wing wall into the back-filled soil behind the wing wall. Secondary reinforcing members in the form of elongated metal fibers or light weight welded wire mesh extend throughout the wing wall, and substantially heavier primary reinforcing bars extend vertically within the wing wall where head portions of reinforcing rods within the anchor member connect with the wing wall. In another embodiment, the reinforcing rods within the anchor member extend through ducts or tubes and have end portions threaded into the tubular anchors precast within the wing wall adjacent the reinforcing rods to provide for attaching the anchor member at the construction site after separately precasting the anchor member and wing wall.

6854928, Feb 15, 2005

Jan 29, 2003

10/353477

William D. Lockwood - Dayton OH, US

Con/Span Bridge Systems Ltd. - Dayton OH

E01F005/00

405124, 52 88, 52 89

A three piece concrete culvert system includes a set of horizontally spaced precast side wall sections having inwardly projecting and opposing steps or surfaces which support opposite ends of a precast arched top wall section. The side wall sections include extension portions which project substantially above the ends of the top wall section for increasing the capacity of the side wall sections to resist thrust from the top wall section. Vertically spaced and generally horizontal layers of soil reinforcement members or grids may be positioned within the soil backfilled adjacent the outer surfaces of the side wall sections, and precast concrete anchor members may be attached to the side wall sections above supporting footers for the side wall sections. Shims are used between the footers and the anchor members for temporarily positioning and aligning the side wall sections before receiving the top wall section.

D490533, May 25, 2004

Jan 24, 2003

29/174704

William D. Lockwood - Dayton OH

Con/Span Bridge Systems Ltd. - Dayton OH

2503

D25 1, D25122