If I do an advanced search at the US Patent and Trademark Office:
http://patft1.uspto.gov/netahtml/PTO/search-adv.htm
For "IN/walster and in/william"
I get 29 patents issued to Bill Walster, et al., and assigned to Sun
Microsystems:
7,296,047 Full-Text Method and apparatus for solving overdetermined systems of interval linear equations
7,289,122 Full-Text Method and apparatus for approximating an arbitrary shape with a closed Bezier curve
7,222,146 Full-Text Method and apparatus for facilitating exception-free arithmetic in a computer system
7,222,145 Full-Text Method and apparatus for solving systems of equations in fixed-point form
7,171,343 Full-Text Computing interval parameter bounds from fallible measurements using systems of nonlinear equations
7,099,851 Full-Text Applying term consistency to an equality constrained interval global optimization problem
7,062,524 Full-Text Method and apparatus for solving an inequality constrained global optimization problem
7,028,065 Full-Text Applying term consistency to an inequality constrained interval global optimization problem
7,028,016 Full-Text Applying term consistency to the solution of unconstrained interval global optimization problems
6,993,548 Full-Text Method and apparatus for bounding the solution set of a system of linear equations
6,976,048 Full-Text Method and apparatus solving problems having interval parameters
6,961,743 Full-Text Method and apparatus for solving an equality constrained global optimization problem
6,950,844 Full-Text Method and apparatus for solving systems of linear inequalities
6,922,713 Full-Text Method and apparatus for solving an unconstrained global optimization problem
6,920,472 Full-Text Termination criteria for the interval version of Newton's method for solving systems of non-linear equations
6,915,321 Full-Text Method and apparatus for solving systems of nonlinear equations using interval arithmetic
6,915,320 Full-Text Termination criteria for the one-dimensional interval version of newton's method
6,895,574 Full-Text Method and apparatus for automatically producing efficient code for computing derivatives
6,895,422 Full-Text Method and apparatus for computing roots of a polynomial equation with interval coefficients
6,859,817 Full-Text Solving systems of nonlinear equations using interval arithmetic and term consistency
6,842,764 Full-Text Minimum and maximum operations to facilitate interval multiplication and/or interval division
6,823,352 Full-Text Solving a nonlinear equation through interval arithmetic and term consistency
6,779,006 Full-Text Performing dependent subtraction on arithmetic intervals within a computer system
6,751,638 Full-Text Min and max operations for multiplication and/or division under the simple interval system
6,728,953 Full-Text Selectively enabling expression folding during program compilation
6,668,268 Full-Text Method and apparatus for compiling dependent subtraction operations on arithmetic intervals
6,658,444 Full-Text Method and apparatus for performing a mask-driven interval division operation
6,658,443 Full-Text Method and apparatus for representing arithmetic intervals within a computer system
6,629,120 Full-Text Method and apparatus for performing a mask-driven interval multiplication operation