Patents Assigned to TAC Construction Materials Ltd.
  • Improvements in and relating to board products
    Patent number: 3969567
    Abstract: A fire-resistant board product is comprised of a hydraulic cement binder reinforced by a mixture of long and short staple vitreous fibres, silica in an amount at least sufficient to react with the free lime in the cement, together with from 1 to 10% by weight of a cellulosic fibre. Optionally, the board product further includes at least one low density filler which may provide at least part of the silica component.
    Type: Grant
    Filed: March 8, 1974
    Date of Patent: July 13, 1976
    Assignee: TAC Construction Materials Ltd.
    Inventors: John E. Occleshaw, Terence D. Smith