Patents by Inventor Johannes G. P. Mastboom

Johannes G. P. Mastboom 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).

  • Electrical lamp with a screw base formed by identical halves
    Patent number: 4705984
    Abstract: An electric lamp has a lower bowl portion formed as two semicircular halves, over part of which an Edison lamp cap is screwed. The two bowl halves have identical helical rib portions, the cross-section of each rib portion having a height and length selected so that the lamp cap thread fits over them, engaging top edges of ribs on one bowl half and the lower edges of the ribs on the other bowl half.
    Type: Grant
    Filed: August 28, 1986
    Date of Patent: November 10, 1987
    Assignee: U.S. Philips Corporation
    Inventor: Johannes G. P. Mastboom