Patents by Inventor Clemens Roothaan

Clemens Roothaan 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).

  • Floating point arithmetic unit having logic for quad precision arithmetic
    Patent number: 5631859
    Abstract: A floating point processing system which uses a multiplier unit and an adder unit to perform properly rounded quad precision floating point arithmetic operations using double-extended hardware. The floating point processing system includes quad data muxes for converting a quantity between a quad precision representation and a two double-extended precision quantities and vice versa, wherein the sum, if added at infinite precision, of the two double-extended precision quantities is equal to the quad precision quantity. The floating point processing system further include hardware for performing arithmetic operations on double-extended precision quantities.
    Type: Grant
    Filed: October 27, 1994
    Date of Patent: May 20, 1997
    Assignee: Hewlett-Packard Company
    Inventors: Peter Markstein, Clemens Roothaan, Dennis Brzezinski