Patents by Inventor Sven Gunnar Svenstam

Sven Gunnar Svenstam 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).

  • Steps, stairs and the like
    Patent number: 3993122
    Abstract: A flight of steps, stairs and the like heated by means of a heating medium passing through a pipe means located within the steps, stairs etc. The pipe means is located totally within the confines of the step structure and extends in a tortuous path generally longitudinally of the flight of steps. The pipe is permanently pre-shaped so as to present interconnected, generally arcuate looped portions and is made to conform to the step configuration substantially solely by being twisted at selected regions along its length.
    Type: Grant
    Filed: September 24, 1975
    Date of Patent: November 23, 1976
    Assignee: Granges Essem Aktiebolag
    Inventor: Sven Gunnar Svenstam