Patents by Inventor David A. Crocker

David A. Crocker 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).

  • Patent number: 5472499
    Abstract: A lightweight cementitious composition comprising a dry mixture of a hydraulic cement component and a lightweight aggregate component of about 75 ppcf or less and a process involving mixing with water to produce a slurry containing at least 4 volume percent entrained air and which is easily workable and sets to produce a lightweight concrete mass having a strength of 2500 psi and a density of 115 ppcf or less. The hydraulic cement component can include two or three cement constituents. One constituent is a Type S, Type M or Type N masonry cement. A second constituent is a pozzolanic cement or an expansive cement, and a third constituent is a Type I cement, Type II cement or a Type III portland cement. In this mixture the first and second cement constituents are each present in an amount less than the third cement constituent.
    Type: Grant
    Filed: July 11, 1994
    Date of Patent: December 5, 1995
    Assignee: Texas Instruments, Inc.
    Inventor: David A. Crocker
  • Patent number: 5328507
    Abstract: A light weight cementitious composition comprising a dry mixture of a hydraulic cement component and an aggregate component and which, upon mixing with water, produces a paste which is easily workable and sets to produce a light weight concrete mass. The hydraulic cement component includes at least two and usually three cement constituents. One constituent is a Type S, Type M or Type N masonry cement. A second constituent is a pozzolanic cement or an expansive cement, and a third constituent is a Type I cement, Type II cement or a Type III portland cement. In this mixture the first and second cement constituents are each present in an amount less than the third cement constituent. The second aggregate component in the dry mixture comprises a light weight aggregate present in an amount to provide a bulk density for the dry mixture of no more than 100 pounds per cubic foot and more specifically, a bulk density of about 85 pounds per cubic foot, or less.
    Type: Grant
    Filed: September 23, 1992
    Date of Patent: July 12, 1994
    Assignee: Texas Industries, Inc.
    Inventor: David A. Crocker
  • Patent number: 5234497
    Abstract: A fast setting cementitious composition which upon hydration with water forms a paste-like slurry useful in stopping leaks in the walls of cement pipes. The cementitious composition comprises a dry mixture of a hydraulic cement component having a first Portland cement constituent and a second calcium aluminate constituent, an aggregate component and a lime component. Upon hydration with 23 wt. % water, the resulting slurry has an initial Vicat setting time within the range of 1-5 minutes and a final Vicat setting time of no more than 6 minutes. The cement component contains the first and second cement constituents in weight ratios within the range of 3:2-2:3. The lime component is present in an amount within the range of 1-4 wt. %.In effecting the repair of a water leak, a paste-like slurry is formed from water and the dry cementitious composition. The cementitious paste is supplied to the repair site.
    Type: Grant
    Filed: June 25, 1990
    Date of Patent: August 10, 1993
    Assignee: Texas Industries, Inc.
    Inventor: David A. Crocker
  • Patent number: 4769077
    Abstract: A dry cementitious composition which is shrinkage compensating and fast-setting for use in grouting repair of concrete surfaces. The cementitious composition comprises a hydraulic cement mixture of a major amount of a first portland cement constituent and a minor amount of a second expansive ettringite sulfoalumina cement constituent, an aggregate component, and an accelerator component. The accelerator component is a polyvalent metal salt of formic acid, specifically an alkaline earth metal formate such as calcium formate. Specific formulations include a mixture of Type I, Type IP, or Type III cement as a first constituent with Type K, Type M, or Type S cement as a second constituent, with the ratio of the first to the second constituent within the range of 2-3.
    Type: Grant
    Filed: June 30, 1987
    Date of Patent: September 6, 1988
    Assignee: Texas Industries, Inc.
    Inventor: David A. Crocker