Patents by Inventor Rolf E. Strand

Rolf E. Strand 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).

  • Temperature control arrangement in heating systems
    Patent number: 4667875
    Abstract: This invention regards a control arrangement for heating systems for localities. Heat is given off continuously and the control may take place by changing the temperature (t.sub.w) of the heat carrier medium, thereby sensing the interior temperature (t.sub.i) in the locality and the outdoor temperature (t.sub.u) outside of the locality. A function controller (33) is fed with a known functional relation between the outdoor temperature (t.sub.u) and the temperature (t.sub.w) of the heat carrier medium. The difference between the existing inside temperature (t.sub.i) and the desired inside temperature (t.sub.r) is stated, and the functional relation between the outdoor temperature (t.sub.u) and the temperature of the heat transfer medium (t.sub.w) is divided up into a number of zones, limited from each other dependent upon the difference between the desired inside temperature (t.sub.r) and the inside temperature proper (t.sub.i).
    Type: Grant
    Filed: March 1, 1985
    Date of Patent: May 26, 1987
    Assignee: Tour & Andersson AB
    Inventors: Rolf E. Strand, Per-Lennart Persson