Apparatus for forming concrete planks or slabs having acoustical properties
United States Patent 3217375
US Patent References:
/0857586.html
- - 0857586

/0940061.html
- - 0940061

/0965150.html
- - 0965150

/1191731.html
- - 1191731

/1274987.html
- - 1274987


Inventors:
Kinnard, Claiborne H.
Publication Date:
11/16/1965
View Patent Images:
Download PDF 3217375 pdf       PDF help
Export Citation:
Click for automatic bibliography generation
Assignee:
SPAN DECK INC
Primary Class:
425/130
Other Classes:
264/228, 425/219, 425/64, 425/218, 264/DIG.057, 264/256
International Classes:
B28B1/08; B28B1/16; B28B3/20; B28B11/16; B28B19/00; B28B11/14
US Patent References:
1684525Method of forming cement blocks
1688422Process of treating earthy minerals
1720855Method and apparatus for making wall board
1987779Heat resisting panel and method of making same
2299070Cast slab
2324760Pipe former and layer
2406025Pipe forming machine
2457982Method of producing building panels
2618832Casting apparatus
2648116Method of making hollow monolithic concrete slabs
2778088Manufacture of roofing slabs and the like
2839812Method of manufacturing a structural panel
2948042Apparatus for making hollow reinforced concrete bodies
2956375Pre-cast concrete beam construction
2970361Molding machine
3002249Machine for the manufacture of concrete building units
Foreign References:
DE832870C
GB708729A
GB723009A