Patents by Inventor Michael H. Chaddock

Michael H. Chaddock 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).

  • Program check for a non-volatile memory
    Patent number: 4943948
    Abstract: A non-volatile memory has memory cells which are programmable to a programmed state from an unprogrammed state. Programming changes the conductivity of the memory cell which is being programmed. The particular state of a selected memory cell is determined by comparing the conductivity of the selected memory cell to that of a normal reference. In order to assure that a memory cell has been programmed to a conductivity which is sufficient for reliable detection, a substitute reference with a different conductivity is used immediately after programming. If the selected cell is detected as being programmed when compared to the substitute reference, the selected cell is then determined to have been sufficiently programmed for reliable detection using the normal reference.
    Type: Grant
    Filed: June 5, 1986
    Date of Patent: July 24, 1990
    Assignee: Motorola, Inc.
    Inventors: Bruce L. Morton, Bruce E. Engles, Michael H. Chaddock