Patents Assigned to Luigi Riva
  • Method of cooling air in the under-roof spaces of buildings
    Patent number: 6367275
    Abstract: Method of cooling air in under-roof spaces of buildings, comprising the following steps: a) mixing water, cement, aluminium powder and a material selected from sand, gravel and the like, into a smooth mixture; b) spreading the smooth mixture over the roof to obtain a uniform layer of porous concrete; c) drying the layer; and d) soaking the layer with water.
    Type: Grant
    Filed: January 26, 1999
    Date of Patent: April 9, 2002
    Assignee: Luigi Riva
    Inventor: Rudolf Stephan