Patents by Inventor Petrus A. Lemmens

Petrus A. Lemmens 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).

  • System for treating gases or fluids with pulsed corona discharges
    Patent number: 6033565
    Abstract: System for treating gases or liquids by corona discharge, comprising: a) a corona discharge space through which the gases or fluids to be treated are guided; b) a corona wire inside the corona discharge space; c) a source for supplying high voltage pulses, whereby the output of the source is connected to the corona wire; d) sensors for measuring the power dissipated in the corona discharge space; e) an electromagnetically compatible case.
    Type: Grant
    Filed: July 17, 1998
    Date of Patent: March 7, 2000
    Assignee: Stichting voor de Technische Weteschappen
    Inventors: Egbertus Johannes Maria Van Heesch, Hendriekus Wilhelmus Maria Smulders, Robertus Hendricus Petrus Lemmens, Pieter Cornelis Tobias Van Der Laan
  • Method of manufacturing lens elements
    Patent number: 4895585
    Abstract: A method of manufacturing lens elements, in which a glass preform heated to the softening temperature and an annular metal holder (3) enclosing the glass preform are arranged between the heated moulding dies (7,9) of a mould and are moulded in a pressing step into a lens element comprising a glass lens (21) and a ring (3) enclosing the glass lens and acting as a fitting. During moulding, the ring 3 forms together with the two dies (7,9) a quasi closed moulding cavity having an annular gap (15). During moulding, the ring (3) is expanded radially and a quantity of glass is pressed.
    Type: Grant
    Filed: September 8, 1988
    Date of Patent: January 23, 1990
    Assignee: U.S. Philips Corp.
    Inventors: Johannes H. Angenent, Nicodemus Hattu, Petrus Heller, Petrus A. Lemmens, Cornelis J. T. Potters, Johan C. Wijn