Seifert, P.; Hatton, D.; and Bliss, T.; US 4,155,839, "Reverse Centrifugal Cleaning of Paper Making Stock," May 22, 1979.
Bliss, T.; US 4,564,443, "Reverse Centrifugal Cleaning of Paper Making Stock," Jan. 14, 1986.
Bliss, T.; Chupka, D. E.; McCarthy, C. E.; and Walters, L. J.; US 5,021,159, "Apparatus for Thickening Pulp and Paper Stock," June 4, 1991.
Chupka, D. E.; Bliss, T. L.; Hatton, D. R.; Seifert, P.; and Winkler, J. L.; US 5,078, 275, "Screening Apparatus for Paper Making Stock," Jan. 7, 1993.
Seifert, P.; Chupka, D. E., and Bliss, T. L., “Apparatus for Dewatering and/or Washing of Papermaking Stock,” US 5,591,336, Jan. 7, 1997.
Corresponding foreign patents issued or pending.