George Clinton Brookhart, JR
Engineers at Briarwood Ave, Littleton, CO

6016968, Jan 25, 2000

Apr 15, 1999

9/292551

George Clinton Brookhart - Littleton CO
James A. Baker - Littleton CO
Paul B. Miller - Highlands Ranch CO

Oldcastle Precast, Inc. - Littleton CA

E01B 100

238 2

The present invention discloses a precast railway crossing slab adapted to extend transversely across the surface of conventional railway ties, with slots or gaps dimensioned and disposed to receive a pair of railway rails therethrough. The crossing slab includes a post-tensioning system in which metal cable strands or tendons are sheathed within plastic tubes and are positioned in the slab mold frame prior to pouring of concrete. Tendon anchors are also disposed in the slab mold frame prior to pouring. After the concrete hardens, a hydraulic jack is used to tension and anchor the tendons in a stressed condition, thus providing reinforcement to the slab. The railway crossing slab of the present invention may be utilized with or without surface or edge metal plating. Flange way fillers which typically comprise rubber strips extending between the sidewalls of the metal rail and the concrete slab may optionally be employed. The slab may be formed integrally with grooves to receive the rails, or alternatively may take the form of three separate slabs provided with screw holes for securement to conventional wooden or concrete railway ties.

5924630, Jul 20, 1999

Jul 21, 1997

8/897391

George Clinton Brookhart - Littleton CO
James A. Baker - Littleton CO
Paul B. Miller - Highlands Ranch CO

Oldcastle Precast, Inc. - Littleton CO

E01C 904

238 8

The present invention discloses a precast railway crossing slab adapted to extend transversely across the surface of conventional railway ties, with slots or gaps dimensioned and disposed to receive a pair of railway rails therethrough. The crossing slab includes a post-tensioning system in which metal cable strands or tendons are sheathed within plastic tubes and are positioned in the slab mold frame prior to pouring of concrete. Tendon anchors are also disposed in the slab mold frame prior to pouring. After the concrete hardens, a hydraulic jack is used to tension and anchor the tendons in a stressed condition, thus providing reinforcement to the slab. The railway crossing slab of the present invention may be utilized with or without surface or edge metal plating. Flange way fillers which typically comprise rubber strips extending between the sidewalls of the metal rail and the concrete slab may optionally be employed. The slab may be formed integrally with grooves to receive the rails, or alternatively may take the form of three separate slabs provided with screw holes for securement to conventional wooden or concrete railway ties.

6149067, Nov 21, 2000

Dec 14, 1999

9/460927

George Clinton Brookhart - Littleton CO
James A. Baker - Littleton CO
Paul B. Miller - Highlands Ranch CO

Oldcastle Precast, Inc. - Littleton CO

E01B 100

238 8

The present invention discloses a precast railway crossing slab adapted to extend transversely across the surface of conventional railway ties, with slots or gaps dimensioned and disposed to receive a pair of railway rails therethrough. The crossing slab includes a post-tensioning system in which metal cable strands or tendons are sheathed within plastic tubes and are positioned in the slab mold frame prior, to pouring of concrete. Tendon anchors are also disposed in the slab mold frame prior to pouring. After the concrete hardens, a hydraulic jack is used to tension and anchor the tendons in a stressed condition, thus providing reinforcement to the slab. The railway crossing slab of the present invention may be utilized with or without surface or edge metal plating. Flange way fillers which typically comprise rubber strips extending between the sidewalls of the metal rail and the concrete slab may optionally be employed. The slab may be formed integrally with grooves to receive the rails, or alternatively may take the form of three separate slabs provided with screw holes for securement to conventional wooden or concrete railway ties.

4574536, Mar 11, 1986

Sep 25, 1981

6/305405

Barry H. Bamber - Broughshane, GB5
George C. Brookhart - Littleton CO
Alan H. Sabatino - Littleton CO

Oldcastle, Inc. - Los Angeles CA

E04D 3362

521253

A roof tile is provided with a pair of batten lugs and a pair of stacking lugs protruding from the bottom side thereof. The batten lugs are positioned very close to and taper to the edge at the head end of the tile so that the thickness of the tail end of the tile may be relatively thin and may be equal to the thickness at the edge of the tile head end. The stacking lugs are positioned longitudinally away from the tail end of the tile so as not to interfere with tile overlapping. The thickness of the tile from the front surface thereof to the tip of each batten lug is substantially equal to the thickness of the tile from the front surface thereof to the tip of each stacking lug such that the tile may be stacked with other similar tiles without need to rotate every other tile by 180. degree. The longitudinal position of the stacking lugs away from the tail end of the tile strengthens the tile and substantially inhibits breakage of the tile during shipping and handling, especially when stacked with other similar tiles. The roof tile is also provided with a wedge shaped protuberance for engaging a cable in a transport conveyer and restraining the same from movement laterally outwardly relative to the tile when the tile is carried on the cable.