Patents by Inventor Donald P. Gaffney

Donald P. Gaffney 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).

  • Patent number: 4446535
    Abstract: This invention provides improved non-volatile semiconductor memories which form non-inverting signals and which include a one device dynamic volatile memory circuit having a storage capacitor which includes a conductive plate, a charged floating gate and an inversion layer in a semiconductor substrate together with a non-volatile device including the floating gate, a control electrode and a voltage divider having first and second serially-connected capacitors, with the floating gate being disposed at the common point between the first and second capacitors. The plate of the storage capacitor is connected to a reference voltage source. The control electrode is capacitively coupled to the floating gate through the first capacitor which includes a charge or electron injector structure. The capacitance of the first capacitor has a value, preferably, substantially less than that of the second capacitor which is formed between the floating gate and the semiconductor substrate.
    Type: Grant
    Filed: December 31, 1981
    Date of Patent: May 1, 1984
    Assignee: International Business Machines Corporation
    Inventors: Donald P. Gaffney, Gary D. Grise, Chung H. Lam