1. Couillard, F. Chromatography Apparatus, US Patent 4,597,866, 1986-07-01.
2. Petro, M. and Nguyen, S.H. Liquid Chromatography Column Distributor. US Patent Application US20020099452, 3003-09-18.
3. Colvin jr, A.E. and Hanley, M.W. Fluid Control Device. US Patent 4,894,152, 1990-01-16.
4. McNeil, R. Fluid Flow Control Device. US Patent 4,354,932, 1982-10-19.