Road structure – process – or apparatus – Apparatus – Means to agitate material
Reexamination Certificate
2008-01-08
2008-01-08
Hartmann, Gary S. (Department: 3671)
Road structure, process, or apparatus
Apparatus
Means to agitate material
C404S118000
Reexamination Certificate
active
07316523
ABSTRACT:
Methods and apparatus for screeding freshly placed concrete in which the acoustic impedance of the treating equipment is made substantially equal to the acoustic impedance of the concrete slab. Portions of the screed contacting the plastic concrete are matched to an acoustic impedance approximating the acoustic impedance of plastic concrete, promoting the energy transferred to the concrete. The acoustic matching material is fabricated from a material that has an acoustic impedance within 67% to 150% of the acoustic impedance of the concrete being finished. The acoustic matching material has an abrasion resistance of no greater than 150 measured using ASTM Method G-65 where steel is given a rating of 100. The preferred matching material comprises ultra-high molecular weight polyethylene (UHMWPE) plastic.
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Allen J. Dewayne
Bishop Richard P.
Allen Engineering Corporation
Carver Stephen D.
Hartmann Gary S.
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