Hollow Block Patents (Class 425/DIG111)
  • Mould for producing concrete mouldings
    Patent number: 4343453
    Abstract: A mould for producing concrete mouldings having a frame and a plurality of moulding boxes therein with the moulding boxes removably fastened directly to the bottom end faces of the frame.
    Type: Grant
    Filed: July 7, 1980
    Date of Patent: August 10, 1982
    Assignee: Rampf KG Formen GmbH & Co.
    Inventor: Guenter Rodon
  • Die for extruding a honeycomb structural body
    Patent number: 4243370
    Abstract: A die for extruding a honeycomb structural body which comprises a throttle portion having a plurality of openings where the forcedly supplied raw stock flow is throttled at the rear surface side of the die, a reservoir portion provided with a plurality of guide channels, an opening portion having a plurality of openings and guide slots, and discharge slits.
    Type: Grant
    Filed: December 4, 1978
    Date of Patent: January 6, 1981
    Assignees: NGK Insulators, Ltd., Institute of Technology Precision Electrical Discharge Works
    Inventors: Noboru Higuchi, Shoji Futamura