Patents by Inventor Hugo Ledermann

Hugo Ledermann 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).

  • Clothes-pin
    Patent number: 4945613
    Abstract: The clothes-pin consists of a spring element and two identically formed members having a clamping section and a handle section. The spring element connects the two members in that on the one hand the end engages the blind hole and on the other hand it surrounds the support position.The clothes-pin is remarkable by its simple design and assembly.
    Type: Grant
    Filed: December 14, 1988
    Date of Patent: August 7, 1990
    Inventor: Hugo Ledermann
  • Heat-pump system for hot-water room-heating
    Patent number: 3959986
    Abstract: A heat pump system for space heating by hot water using external air as a source of heat with an air cooler acting as evaporator, a compressor and a condenser for heating the water, with the heat pump capable of operating in two temperature ranges if the external temperatures are low. The system also includes a hot-water storage vessel and water cooler and a defrosting regulator to defrost by hot compressed, evaporated cooling agent.
    Type: Grant
    Filed: October 15, 1974
    Date of Patent: June 1, 1976
    Inventor: Hugo Ledermann