1. 2. R. L. Kuehner, 1954 . Process for deodorizing and sterilizing air. U. S. Patent No. 2,683,074. July 6.
2. 3. R. L. Kuehner, and N. E. Hopkins. 1959 . Method of deodorizing and sterilizing air in enclosed spaces. U. S. Patent No. 2,876,507. March 10.
3. 4. B. W. Gamson, and R. L. Kuehner. 1962 . Composition and method for deodorizing air. U. S. Patent No. 3,049,399. August 14.