Patents by Inventor Alister Black

Alister Black has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process and apparatus for continuously prestressing concrete products
    Patent number: 4240776
    Abstract: An apparatus for prestressing reinforcing tendons in concrete products comprising means for supplying continuous tendons over an elongated mould bed. Primary anchoring means grip and stress the tendons while permitting placement of one of a series of moulds. Secondary anchoring means are fixed to means for advancing the moulds along the bed to permit transferring of the grip on the tendons between the primary and secondary anchoring means or vice versa to maintain the prestressing force.
    Type: Grant
    Filed: April 5, 1979
    Date of Patent: December 23, 1980
    Assignee: Universal Development Company Ltd.
    Inventor: Alister Black
  • Process and apparatus for continuously prestressing concrete products
    Patent number: 4186169
    Abstract: A method and apparatus of prestressing reinforcing tendons in concrete products manufactured in separable moulds in a production line wherein the tendons are prestressed in a first product mould, a product is moulded in the first mould, a subsequent mould is then placed in series with the first mould, the reinforcing tendons are then prestressed between a point at the head of the production line and a previously moulded product.
    Type: Grant
    Filed: October 19, 1977
    Date of Patent: January 29, 1980
    Assignee: Universal Development Company Limited
    Inventor: Alister Black