Patents by Inventor Johannes R. Roulaux

Johannes R. Roulaux 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).

  • Patent number: 5729264
    Abstract: An ink jet recording device includes an ink jet recording head comprising at least one pressure chamber communicating with an ink reservoir via an ink supply channel and a nozzle plate comprising at least one nozzle opening for emitting droplets of ink, the nozzle plate forms a wall of the pressure chamber. The recording head further comprises a piezoelectric actuator element having an active direction and comprising at least one layer of piezoelectric material and at least two electrode layers which are arranged such that the dimension of the actuator element in the active direction is varied upon application of an electric voltage between terminals that are electrically connected to the electrode layers. The actuator element is arranged in cooperative relationship with the pressure chamber so that the pressure chamber changes its volume when the dimension of the actuator element in the active direction is varied.
    Type: Grant
    Filed: November 13, 1995
    Date of Patent: March 17, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Joseph R.R. Pankert, Johannes R. Roulaux