Patents by Inventor Josephus J. M. Schraven

Josephus J. M. Schraven 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: 5397528
    Abstract: A method of closing a mold and a press therefore, whereby a first mold part is moved towards a second mold part by a first relatively large displacement via a mechanical non-fluid drive. The mold parts are then pressed against one another by a fluid system including a pneumatically driven hydraulic system to provide relative high mold pressures. Drive and follower pins are selectively coupled to the hydraulic system by a carousel for selectively coupling a mold part to the hydraulic system during the pressing portion of the cycle. The method and press are particularly suitable for encapsulating electrical components.
    Type: Grant
    Filed: July 22, 1993
    Date of Patent: March 14, 1995
    Assignee: U.S. Philips Corporation
    Inventors: Josephus J. M. Schraven, Marinus B. J. De Kruijff
  • Patent number: 5252053
    Abstract: A method of closing a mold and a press therefore, whereby a first mold part is moved towards a second mold part by a first relatively large displacement via a mechanical non-fluid drive. The mold parts are then pressed against one another by a fluid system including a pneumatically driven hydraulic system to provide relative high mold pressures. Drive and follower pins are selectively coupled to the hydraulic system by a carousel for selectively coupling a mold part to the hydraulic system during the pressing portion of the cycle. The method and press are particularly suitable for encapsulating electrical components.
    Type: Grant
    Filed: June 4, 1991
    Date of Patent: October 12, 1993
    Assignee: Boschman Technologies B.V.
    Inventors: Josephus J. M. Schraven, Marinus B. J. de Kruijff
  • Patent number: 5158780
    Abstract: A device for simultaneously encapsulating a number of electronic components is provided with a locking mechanism in which a molding cycle has two phases, i.e. in a first transfer phase, during which plungers for injecting molten resin into encapsulation cavities are locked and driven at a high, controlled speed, followed by a second curing phase, during which the plungers are spring-loaded, unlocked, and stationary, and are subject to the same maximum pressure of the transfer phase. In this way damage to the products is prevented, while the cycle time is reduced and the products obtained have an even and smooth appearance.
    Type: Grant
    Filed: June 4, 1991
    Date of Patent: October 27, 1992
    Assignee: Boschman Technologies B.V.
    Inventors: Josephus J. M. Schraven, Marinus B. J. de Kruijff, Maarten Hoekstra