Patents by Inventor Heikki Ruotoistenmäki

Heikki Ruotoistenmäki 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).

  • Force or pressure sensor and method for applying the same
    Patent number: 7726209
    Abstract: The invention relates to a force or pressure sensor and a method for applying the same. The pressure sensor comprises a substantially rigid, mechanical-load resistant frame (1), a flexible diaphragm (2) secured over its peripheral rim to the frame (1), and a piezoelectric sensor diaphragm (3) applied to the surface of the flexible diaphragm (2). The sensor diaphragm (3) loading element comprises a substantially rigid, mechanical-load resistant cover (4), having its protrusion or shoulder (4a) bearing against a middle section of the flexible diaphragm (2) and thereby prestressing the flexible diaphragm (2) and the piezoelectric sensor diaphragm (3) attached thereto. The frame (1) and the cover (4) define therebetween a closed, hermetically sealed housing chamber, the flexible diaphragm (2) and the piezoelectric sensor diaphragm (3) being located thereinside.
    Type: Grant
    Filed: August 15, 2003
    Date of Patent: June 1, 2010
    Assignee: Finsor Oy
    Inventor: Heikki Ruotoistenmäki