Patents by Inventor John P. Luker

John P. Luker 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).

  • Expansive cement
    Patent number: 4002483
    Abstract: An improved expansive cement composition is provided which has the increased capability of being able to " grab" steel reinforcement members therewithin as the material is curing and expanding to result in effective stressing of the reinforcement members. This cement is made of particulate argillaceous and calcareous materials, and contains from about 1 to about 70% by weight of free CaO and from about 2 to about 7% by weight of MgO uniformly distributed therein, with the remaining portion being primarily tricalcium silicate and containing substantially no dicalcium silicate.
    Type: Grant
    Filed: June 12, 1975
    Date of Patent: January 11, 1977
    Assignee: General Portland, Inc.
    Inventors: Kenneth E. Daugherty, John P. Luker, Joseph H. Allen, Waldemar A. Klemm