Patents by Inventor Charles N. Ludvik

Charles N. Ludvik has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Thin film composite membranes and their method of preparation and use
    Patent number: 8617395
    Abstract: The present invention is a technique to fabricate thin-film composite perm-selective membranes by a transfer method. The composite membranes are useful in separating liquid, vapor or gaseous mixtures by selective permeation and reduce mass transfer resistance of the support layer. Selectivity and flux are improved by reduction of the mass transfer resistance of the support layer.
    Type: Grant
    Filed: November 8, 2010
    Date of Patent: December 31, 2013
    Assignee: The United States of America, as represented by the Secretary of Agriculture
    Inventors: Richard D Offeman, Charles N Ludvik
  • Fiber reinforced composites
    Patent number: 8187423
    Abstract: In one aspect, the invention is directed to an efficient and economical process for dispersing fiber in water and clay. In another aspect, the process for dispersing fiber in water and clay is used in methods of making fiber reinforced composite products. In another aspect, the dispersed fiber/clay material is formulated to make products which include, but which are not limited to, fiber reinforced thermoplastic composites, paperboard products, kitty litter, and/or lightweight building materials comprising fiber.
    Type: Grant
    Filed: May 9, 2006
    Date of Patent: May 29, 2012
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: Gregory M. Glenn, Charles N. Ludvik
  • THIN FILM COMPOSITE MEMBRANES AND THEIR METHOD OF PREPARATION AND USE
    Publication number: 20120080147
    Abstract: The present invention is a technique to fabricate thin-film composite perm-selective membranes by a transfer method. The composite membranes are useful in separating liquid, vapor or gaseous mixtures by selective permeation and reduce mass transfer resistance of the support layer. Selectivity and flux are improved by reduction of the mass transfer resistance of the support layer.
    Type: Application
    Filed: November 8, 2010
    Publication date: April 5, 2012
    Applicant: The United States of America, as represented by the Secretary of Agriculture
    Inventors: Richard D. Offeman, Charles N. Ludvik
  • Preparation of trisubstituted benzoic acid precursors
    Patent number: 5055605
    Abstract: The process of the present invention relates to the preparation of precursor trisubstituted benzoic acid intermediates having the structural formula ##STR1## wherein R is --COOR.sup.a wherein R.sup.a is C.sub.1 -C.sub.6 alkyl; C.sub.1 -C.sub.4 alkyl; formyl or C(O)R.sup.b wherein R.sup.b is C.sub.1 -C.sub.4 alkyl;R.sup.1 is hydrogen, halogen, nitro, C.sub.1 -C.sub.2 alkyl, C.sub.1 -C.sub.2 alkoxy or trifluoromethyl;R.sup.2 is hydrogen, halogen, C.sub.1 -C.sub.4 alkoxy, C.sub.1 -C.sub.4 alkyl --OCH.sub.2 CH.sub.2 OCH.sub.3, --OCH.sub.2 CH.sub.2 OC.sub.2 H.sub.5 or a substituted methyl group andR.sup.3 is C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 haloalkyl.
    Type: Grant
    Filed: October 15, 1990
    Date of Patent: October 8, 1991
    Assignee: Imperial Chemical Industries plc
    Inventor: Charles N. Ludvik
  • Method for preparation of alkylsulfonyl alkylchlorobenzenes
    Patent number: 4675447
    Abstract: An improved process for the production of compounds having the formula ##STR1## in which R.sub.1 and R.sub.2 are lower alkyl by reacting a compound having the formula ##STR2## with sulfuryl chloride in the presence of a catalytic amount of a metal halide, the improvement in the process being reducing undesired impurities.
    Type: Grant
    Filed: March 21, 1986
    Date of Patent: June 23, 1987
    Assignee: Stauffer Chemical Company
    Inventor: Charles N. Ludvik