Patents by Inventor Chuen-Ing J. Tseng

Chuen-Ing J. Tseng 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).

  • Polymeric hydantoin quaternary compounds, methods of making
    Patent number: 5785963
    Abstract: The present invention relates to a class of novel polymeric hydantoin quaternary compounds, obtained either via a reaction of a hydantoin diamine and an organic dihalide or epichlorohydrin or via a reaction of hydantoin dichloride with an organic diamine. These polymeric hydantoin quaternary compounds have unexpected properties which make them very useful as low foaming biocidal, fungicidal and algicidal agents.
    Type: Grant
    Filed: March 27, 1996
    Date of Patent: July 28, 1998
    Assignee: Lonza, Inc.
    Inventor: Chuen-Ing J. Tseng
  • Low foam branched alkyldimethylamine oxides
    Patent number: 5486315
    Abstract: An amine oxide having the formula: ##STR1## wherein the R.sub.1 groups are independently selected from C.sub.1 -C.sub.4 alkyl or alkoxy groups and R.sub.2 is a branched chain C.sub.11 -C.sub.16 alkyl group; a detersive composition containing such amine oxide with amphoteric surfactants and/or alkalizing agent; and the use of said composition for cleaning hard surfaces.
    Type: Grant
    Filed: May 20, 1994
    Date of Patent: January 23, 1996
    Assignee: Lonza Inc.
    Inventor: Chuen-Ing J. Tseng
  • Biocidal process utilizing decylnonyl- and decylisononyl dimethylammonium compounds
    Patent number: 5413722
    Abstract: Quaternary ammonium compounds having the structural formula: ##STR1## wherein X is chloride, bromide, iodide or alkyl carboxylate having a C.sub.1 -C.sub.18 alkyl radical, and R is n-nonyl or isononyl. The disclosed compounds were found to be non-toxic, low foaming, effective biocides in treatment methods for controlling bacteria, algae and molluscs in aqueous systems.
    Type: Grant
    Filed: November 24, 1993
    Date of Patent: May 9, 1995
    Assignee: Lonza Inc.
    Inventors: David W. Eastman, Kenneth J. Iandoli, Chuen-Ing J. Tseng
  • Biocidal decylnonyl- and decylisononyl dimethylammonium compounds
    Patent number: 5290805
    Abstract: Quaternary ammonium compounds having the structural formula: ##STR1## wherein X is chloride, bromide, iodide or alkyl carboxylate having a C.sub.1 -C.sub.18 alkyl radical, and R is n-nonyl or isononyl. The disclosed compounds were found to be non-toxic, low foaming, effective biocides in treatment methods for controlling bacteria, algae and molluscs in aqueous systems.
    Type: Grant
    Filed: November 12, 1991
    Date of Patent: March 1, 1994
    Assignee: Lonza Inc.
    Inventors: David W. Eastman, Kenneth J. Iandoli, Chuen-Ing J. Tseng
  • Mono-iodopropargyl esters of dicarboxylic anhydrides and their use as antimicrobial agents
    Patent number: 5073570
    Abstract: The new compositions of matter of the present invention comprise compounds having one of the following formulas: ##STR1## wherein: R is hydrogen or methyl;n is 1 to 16;R.sub.1 and R.sub.2 are defined as R.sub.3 and R.sub.4 below or are joined to form a cycloalkyl, cycloalkenyl, aromatic or a heterocyclic ring containing an oxygen, nitrogen or sulfur atom or an alkoxy, amino, carboxyl, halo, hydroxyl, keto or a thiocarboxyl substituted derivative thereof;R.sub.3 and R.sub.4 are independently selected from (A) hydrogen, alkyl, cycloalkyo, alkenyl, cycloalkenyl, aryl, a heterocyclic ring containing an oxygen, nitrogen or sulfur atom, alkoxy, amino, carboxyl, halo, hydroxyl, keto or a thiocarboxyl and (B) substituted derivatives of the alkyl, cycloalkyl, alkenyl, cycloalkenyl, aryl and the heterocyclic ring wherein the substitutions are alkyl, cycloalkyl, alkenyl, cycloalkenyl, aryl, alkoxy, amino, carboxyl, halo, hydroxyl, keto or a thiocarboxyl;W may be a single bond, oxygen, NR.sub.5, or (CR.sub.6 R.sub.7).
    Type: Grant
    Filed: February 16, 1989
    Date of Patent: December 17, 1991
    Assignee: Lonza Inc.
    Inventor: Chuen-Ing J. Tseng