Title:
Apparatus for forming concrete planks or slabs having acoustical properties
United States Patent 3217375
Inventors:
Kinnard, Claiborne H.
Publication Date:
11/16/1965
Export Citation:
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Assignee:
SPAN DECK INC
Primary Class:
425/130
Other Classes:
264/228, 264/256, 264/DIG.57, 425/64, 425/218, 425/219
International Classes:
B28B1/08; B28B1/16; B28B3/20; B28B11/14; B28B11/16; B28B13/02; B28B19/00; B28B23/06; E04G21/14; B28B1/08; B28B1/16; B28B3/20; B28B11/14; B28B13/00; B28B19/00; B28B23/02; E04G21/14
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US Patent References:
3002249Machine for the manufacture of concrete building units
2970361Molding machine
2956375Pre-cast concrete beam construction
2948042Apparatus for making hollow reinforced concrete bodies
2839812Method of manufacturing a structural panel
2778088Manufacture of roofing slabs and the like
2648116Method of making hollow monolithic concrete slabs
2618832Casting apparatus
2457982Method of producing building panels
2406025Pipe forming machine
2324760Pipe former and layer
2299070Cast slab
1987779Heat resisting panel and method of making same
1720855Method and apparatus for making wall board
1688422Process of treating earthy minerals
1684525Method of forming cement blocks
1274987N/A
1191731N/A
0965150N/A
0940061N/A
0857586N/A
Foreign References:
DE832870C
GB708729A
GB723009A