Patents by Inventor Per A. H. Jakobsson

Per A. H. Jakobsson 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).

  • Method for the production of building elements of the lightweight concrete type
    Patent number: 4357289
    Abstract: When producing building elements of lightweight concrete a viscous slurry is poured into a mould in order to form a stiff mould body. By means of parting planes this mould body is divided into individual elements of smaller sizes. According to the invention a plurality of zones having different densities and/or natures are formed in the mould body, the individual partin g plane being located within such a zone. Hereby one obtains building elements which include at least two portions having different densities and/or natures.
    Type: Grant
    Filed: January 21, 1981
    Date of Patent: November 2, 1982
    Inventor: Per A. H. Jakobsson
  • Method for binding and clearing animal waste products
    Patent number: 4315761
    Abstract: The object of the invention is to use a finely divided calcium hydrosilicate material, in particular aerated or foamed concrete, as a substance for binding and clearing of urine and excrements of the kind excreted for instance by our pet animals. This material gives rapid and effective drying of the excrements, which, particularly if the material is combined with gypsum as a bond-improving agent, become extremely easy to remove or clear.
    Type: Grant
    Filed: November 15, 1979
    Date of Patent: February 16, 1982
    Inventors: Karl I. Larrson, Per A. H. Jakobsson