Patents by Inventor Constantin Puscasu

Constantin Puscasu 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).

  • Process for producing brown covering layers on copper
    Patent number: 5282890
    Abstract: A method for producing a uniform and adherent brown covering layer (brown patina) on surfaces of semifinished products made of copper, particularly on rolled tapes or sheets used in building construction. The surface of the copper semifinished product is first roughened by means of a mechanical treatment. The copper semifinished product is then heat treated at a temperature lying within the temperature range of 150.degree. to 650.degree. C. for the duration of 0.1 to 30 minutes. The copper semifinished product can be advantageously subjected to a chemical postoxidation treatment immediately following the heat treatment.
    Type: Grant
    Filed: October 28, 1991
    Date of Patent: February 1, 1994
    Assignee: KM-kabelmetal AG
    Inventors: Helmut Protzer, Constantin Puscasu, Stefan Hoveling, Albert Scherger