Patents by Inventor Marten Leonard Schoonman

Marten Leonard Schoonman 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).

  • Self-sanitizing plastic
    Patent number: 4034079
    Abstract: Self-sanitizing plastic containing boric acid and ammonium alum or potassium alum in synergistic combination. Preferably, finely-divided inert particles, such as pigment particles, are also contained in the self-sanitizing plastic.
    Type: Grant
    Filed: November 24, 1975
    Date of Patent: July 5, 1977
    Inventor: Marten Leonard Schoonman
  • Wave responsive hatch cover locking and sealing mechanism
    Patent number: 4004538
    Abstract: Wave impact closes normally open contacts on a marine vessel hatch cover face to initiate or to increase fluid pressure within a collapsible hollow gasket interposed at the interface between a hatch cover and a deck hatchway to lock the hatch cover to the hatchway and to effect a watertight seal therebetween.
    Type: Grant
    Filed: March 19, 1976
    Date of Patent: January 25, 1977
    Inventor: Marten Leonard Schoonman