Improvements in and relating to building blocks

Details Improvements in and relating to building blocks Improvements in and relating to building blocks

1977-10-11

1979-04-24

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

5230912, 52405, 264267, 264DIG2, B29D 2704

Patent

active

041512391

ABSTRACT:
Here is disclosed a method of manufacturing building blocks filled with a cured aminoplast resin foam by forming a curable foam, presenting the cavity to and in sealing relationship with one end of a delivery pipe for the foam and injecting the curable foam through the delivery pipe into the cavity until a back pressure is developed in the delivery pipe. Apparatus for manufacturing the building blocks is also described.

REFERENCES:
patent: 1953452 (1934-04-01), Wertz
patent: 2313110 (1943-03-01), Wertz
patent: 2789095 (1957-04-01), Lindvig
patent: 2809172 (1957-10-01), Keen
patent: 3592207 (1971-07-01), Borello
patent: 3653170 (1972-04-01), Sheckler
patent: 3858839 (1975-01-01), Bowman
patent: 3885363 (1975-05-01), Whittey
patent: 4002002 (1977-01-01), Barnhardt
patent: 4060953 (1977-12-01), Milne
patent: 4067759 (1978-01-01), Vrolyk et al.

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