Abacus Enterprises

N.L. Swanson, "Interoferometric Image Enhancement Device," U.S. Patent no. 5680210, Oct. 21, 1997.

N.L. Swanson, "Heterodyne Filter for Image Enhancement," U.S. Patent no. 5781298, Jul. 14, 1998.

N.L. Swanson and B.D. Billard, "Particle Sizing Technique," U.S. Patent no. 6219138, May 1, 2001.

N.L. Swanson and B.D. Billard, "Electively maximizing and minimizing the scattering and absorption of electromagnetic waves," U.S. Patent no. 6704105, March 9, 2004

N.L. Swanson and B.D. Billard, "Electively maximizing and minimizing the scattering and absorption of electromagnetic waves," U.S. Patent no. 6842242, January 11, 2005.

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