1
Heinz Joachim Muller, Friedbert Wechs: Process for producing microporous powders and membranes. Akzo, Oliff & Berridge, November 6, 1990: US04968733 (137 worldwide citation)

A process produces microporous powders or shaped articles, in particular membranes in the form of flat films, tubular films or hollow fibers, which may be used for controlled release of an active compound, for dialysis, gas separation, ultrafiltration or microfiltration, from polyvinylidene fluoride ...


2
Frank T Gentile, Shelley R Winn, Michael Lysaght, Ulrich Baurmeister, Friedbert Wechs, Henning Rottger: Bioartificial organ containing cells encapsulated in a permselective polyether suflfone membrane. CytoTherapeutics, Ivor R Elrifi, Mintz Levin, November 17, 1998: US05837234 (91 worldwide citation)

A bioartificial organ for implanting to provide a therapeutic effect is prepared containing a core of living cells encapsulated in a foam-like membrane having three regions: a dense, fine-pored, permselective inner region, a middle region that lacks macrovoids and a fine-pored outer region. The memb ...


3
Klaus Gerlach, Nikolaus Mathes, Friedbert Wechs: Fiber structures of split multicomponent fibers and process therefor. Akzona Incorporated, Francis W Young, Jack H Hall, December 16, 1980: US04239720 (67 worldwide citation)

Fibrillatable multicomponent fibers of the matrix segment type and a process for production of fiber structures by splitting shrinkable, basically unset, multi-component fibers consisting of at least two incompatible components which in the fiber cross section are arranged in the form of a matrix an ...


4
Friedbert Wechs: Integral asymmetric polyether-sulfone membrane, process for its production, and use for ultrafiltration and microfiltration. Akzo, Oliff & Berridge, December 11, 1990: US04976859 (62 worldwide citation)

An integral polyether-sulfone membrane with a pore system open at the outer boundaries is in the form of flat films, tubular films or hollow fibers having a maximum pore diameter of 0.02 .mu.m to 2 .mu.m. The pore system is cellular throughout with cells having polyhedrally symmetrical boundaries. T ...


5
Klaus Gerlach, Nikolaus Mathes, Hans Jurgen Pitowski, Friedbert Wechs: Suede-like sheet material. Akzona Incorporated, Francis W Young, Jack H Hall, August 3, 1982: US04342801 (42 worldwide citation)

Staple fibers made from crimped, in particular compression crimped, multicomponent filaments of the matrix/segment type, the cross section of which shows, in addition to the matrix, at least 6 peripheral wedge-shaped or lenticular segments, not completely covered by the matrix, are processed into a ...


6
Nikolaus Mathes, Friedbert Wechs: Process for the preparation of fibrillated fiber structures. Akzona Incorporated, Francis W Young, Jack H Hall, January 18, 1983: US04369156 (31 worldwide citation)

Fiber structures such as staple fibers, filaments, yarns as well as textile sheet structures such as woven or knitted fabrics as well as non-woven fabrics and the like made from multicomponent fibers of the matrix-segment type having in their cross sections a plurality of segments arranged periphera ...


7
Henning Rottger, Friedbert Wechs: Integral, multi-asymmetric, semi-permeable membrane. Akzo Nobel, Oliff & Berridge, July 6, 1999: US05919370 (21 worldwide citation)

Membranes suitable for use in haemodialysis include a separating layer A with a cut-off between 500 and 5,000,000, a support layer B and a layer C which partly determines the hydraulic permeability. The cut-off and hydraulic permeability can be set independently of one another. The membranes are int ...


8
Christoph Josefiak, Friedbert Wechs: Method for the production of porous bodies with adjustable total pore volume, adjustable pore size and adjustable pore walls. Akzo, Michael J Striker, June 10, 1986: US04594207 (15 worldwide citation)

Porous bodies, particularly membranes in the form of hollow filaments, are produced by heating a polymer above the upper critical temperature T.sub.c in a mixture of two compounds A and B, liquid and miscible at the dissolving temperature, whereby the employed mixture (polymer, compounds A and B) in ...


9
Erich Kessler, Thomas Batzilla, Friedbert Wechs, Frank Wiese: Integrally asymmetrical polyolefin membrane. Membrana, Oliff & Berridge, December 24, 2002: US06497752 (15 worldwide citation)

Process for producing integrally asymmetrical hydrophobic polyolefinic membranes with a separation layer, in particular for gas exchange, via thermally induced liquid-liquid phase separation. A solution of at least one polyolefin in a solvent system containing a compound A and a compound B is extrud ...


10
Klaus Gerlach, Nikolaus Mathes, Friedbert Wechs: Fiber structures of split multicomponent fibers and process therefor. Akzona Incorporated, Francis W Young, Jack H Hall, November 30, 1982: US04361609 (11 worldwide citation)

Fibrillatable multicomponent fibers of the matrix segment type and a process for production of fiber structures by splitting shrinkable, basically unset, multi-component fibers consisting of at least two incompatible components which in the fiber cross section are arranged in the form of a matrix an ...