Patents by Inventor Friedrich-Wilhelm Hellwig

Friedrich-Wilhelm Hellwig 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).

  • Method for checking data written into buffered write-read memories in numerically controlled machine tools
    Patent number: 4355390
    Abstract: A method for checking stored data in numerically controlled machine tools with buffered write-read memories is disclosed. The longitudinal sums of associated data are formed in individual write-read memories and are written into a supplementary buffer memory. When the system is switched-on or at periodic intervals, the longitudinal sums of the data are formed and compared with the stored longitudinal sums. In the event of deviations, the affected data block is indicated.
    Type: Grant
    Filed: September 22, 1980
    Date of Patent: October 19, 1982
    Assignee: Siemens Aktiengesellschaft
    Inventors: Friedrich-Wilhelm Hellwig, Werner Schrei
  • Device for testing programs for numerical control of machine tools
    Patent number: 4354251
    Abstract: In numerical controls of machine tools, the downwards (lengthwise) sum of the programmed information of each system program memory (SP1) is stored in an additional memory. For later checking of the memory contents, the downwards sums of the respective memories on the control side are formed and are compared with the stored information. If a sum deviates, a trouble signal is given out as an indication of the defective memory.
    Type: Grant
    Filed: March 6, 1980
    Date of Patent: October 12, 1982
    Assignee: Siemens Aktiengesellschaft
    Inventors: Friedrich-Wilhelm Hellwig, Christian Seeliger