Patents by Inventor Nicolaas Abraham Zondag

Nicolaas Abraham Zondag 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).

  • Methods and plugs to seal apertures in tube plates of heat exchangers provided with tube plates which are locally sealed with these methods and such plates
    Patent number: 4074630
    Abstract: A method and a plug to seal a defective tube of a heat exchanger in the place, where said tube extends in a tube plate, said plug being inserted in the tube plate and having two coaxial cavities, each of which is open at one end and contains an explosive charge and firing means, and said plug being jammed in the tube plate in a gas and liquid tight manner by its radial expansion due to the explosion of its charges -- and a heat exchanger, of which at least one of its tubes has been plugged by means of the described plugs.
    Type: Grant
    Filed: February 10, 1977
    Date of Patent: February 21, 1978
    Assignee: Explosive Metal Working Holland B.V.
    Inventor: Nicolaas Abraham Zondag
  • Method of sealing apertures in tube plates of heat exchangers using explosive plug
    Patent number: 4021907
    Abstract: A method and a plug to seal a defective tube of a heat exchanger in the place, where said tube extends in a tube plate, said plug being inserted in the tube plate and having two coaxial cavities, each of which is open at one end and contains an explosive charge and firing means, and said plug being jammed in the tube plate in a gas and liquid tight manner by its radial expansion due to the explosion of its charges -- and a heat exchanger, of which at least one of its tubes has been plugged by means of the described plugs.
    Type: Grant
    Filed: February 27, 1976
    Date of Patent: May 10, 1977
    Assignee: Explosive Metal Working Holland B.V.
    Inventor: Nicolaas Abraham Zondag
  • Methods for welding two metal pieces of tubing with their ends to each other and to pipe-lines consisting of pieces of tubing thus welded to each other
    Patent number: 3986735
    Abstract: A method for welding two thick-walled metal pieces of tubing of a pipe-line to one another, in which at the joint to be formed between said pieces of tubing overlapping portions thereof extending radially over a small marginal portion of the wall thickness adjacent to the internal cavity of the pipe-line are bonded to each other by the explosion of an internal explosive charge and the portions of the pieces of tubing extending radially over the rest of the wall thickness thereof are thermally welded to one another.
    Type: Grant
    Filed: June 7, 1974
    Date of Patent: October 19, 1976
    Assignee: Explosive Metal Working Holland B.V.
    Inventor: Nicolaas Abraham Zondag