1
Lacey Robert E, Mintz Milton S: Process for effecting changes in solution concentrations. Southern Research Institute, The United States of America represented by the Secretary of Interior, July 11, 1972: US3676335 (6 worldwide citation)

Efficiency of reverse osmosis separation processes is enhanced by reducing the thickness of the boundary layer formed at the membrane-solution interface. This is accomplished by placing a second membrane, which is substantially permeable to the solution, in a close-spaced relationship to the reverse ...


2
Apparatus and process for effecting changes in solution concentrations. May 23, 1969: FR1568573-A (2 worldwide citation)

Efficiency of reverse osmosis separation processes is enhanced by reducing the thickness of the boundary layer formed at the membrane-solution interface. This is accomplished by placing a second membrane, which is substantially permeable to the solution, in a close-spaced relationship to the reverse ...


3
Apparatus and process for effecting changes in solution concentrations. U S Dept Of The Interior, February 4, 1970: GB1180371-A

1,180,371. Electrodialysis; reverse osmosis. UNITED STATES, DEPARTMENT OF THE INTERIOR. 18 April, 1968 [8 June, 1967], No. 18389/68. Heading B1X. The concentration of a solution is altered, e.g. an aqueous salt solution is demineralized, by passing it through a porous, non-selective membrane which e ...


4