Patents by Inventor Appaya R. Naik

Appaya R. Naik 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).

  • Patent number: 5387373
    Abstract: A stable aqueous detergent composition is provided in liquid or gel form containing from 10 to 80% by weight of an active detergent mixture comprising primary alkyl sulphate in an amount of 15 to 75% by weight of the active detergent plus betaine and/or amine oxide in an amount of 10 to 40% by weight of the active detergent mixture. Primary alkyl sulphate having chains of 10 or 11 carbon atoms provides at least 25% by weight of the primary alkyl sulphate present. The betaine and/or amine oxide is at least two thirds of the amount by weight of any primary alkyl sulphate having carbon atom chains of 12 carbon atoms or longer. The C.sub.10 and/or C.sub.11 alkyl sulphate is surprisingly effective as a detergent in such compositions despite higher water solubility than longer chain alkyl sulphate. It can enhance mildness compared to longer chain alkyl sulphate, and can replace or partially replace alkyl ether sulphate. Nonionic detergent may be included to enhance mildness further.
    Type: Grant
    Filed: January 25, 1993
    Date of Patent: February 7, 1995
    Assignee: Unilever Patent Holdings B.V.
    Inventor: Appaya R. Naik
  • Patent number: 4732707
    Abstract: Alkyl ether sulphates are disclosed that are derived substantially wholly from C.sub.12 and C.sub.13 alcohols, at least 50% by weight being branched at the 2-position and at least 30% by weight being 2-ethyl or more highly branched. Foaming detergent compositions containing an alkylbenzene sulphonate and/or a dialkyl sulphosuccinate in combination with an alkyl ether sulphate of this specific type exhibit excellent foaming and detergency and are especially suitable for hand dishwashing.
    Type: Grant
    Filed: January 30, 1987
    Date of Patent: March 22, 1988
    Assignee: Lever Brothers Company
    Inventors: Appaya R. Naik, Francesco M. Orlandini
  • Patent number: 4680143
    Abstract: A high foaming aqueous liquid detergent composition suitable inter alia for manual dishwashing is based on a ternary active detergent system of (a) dialkyl sulphosuccinate, (b) alkylbenzene sulphonate and/or secondary alkane sulphonate and (c) alkyl ether sulphate. This combination gives both performance and formulation (viscosity, hydrotropy) benefits.
    Type: Grant
    Filed: June 25, 1985
    Date of Patent: July 14, 1987
    Assignee: Lever Brothers Company
    Inventors: David J. Edge, Appaya R. Naik, Melvin Scott
  • Patent number: 4596672
    Abstract: In a foaming liquid detergent composition suitable inter alia for hand dishwashing and including in its detergent-active system a dialkyl sulphosuccinate, performance is enhanced and physical characteristics (stability, viscosity, hydrotrope requirement) are improved by the inclusion of a fatty acid dialkanolamide such as lauric diethanolamide.
    Type: Grant
    Filed: June 21, 1985
    Date of Patent: June 24, 1986
    Assignee: Lever Brothers Company
    Inventors: Malcolm G. J. MacDuff, Appaya R. Naik, Melvin Scott
  • Patent number: 4537709
    Abstract: In light-duty liquid detergent compositions suitable for hand dishwashing, improved foaming performance, especially in hard water, is obtained by using combinations of particular alkylbenzene sulphonates (linear C.sub.10 -C.sub.13 alkylbenzene sulphonates substantially free of other alkyl chain lengths and containing only minor amounts of C.sub.13 material) and particular alkyl ether sulphates (those containing 20% or less of C.sub.14 and above material and having an average degree of ethoxylation of from 1 to 12).
    Type: Grant
    Filed: November 14, 1983
    Date of Patent: August 27, 1985
    Assignee: Lever Brothers Company
    Inventors: David J. Edge, Appaya R. Naik, Melvin Scott
  • Patent number: 4528128
    Abstract: Detergent compositions suitable inter alia for hand dishwashing include as active detergent a mixture of dialkyl sulphosuccinates obtained from a mixture of C.sub.7 and C.sub.8 aliphatic alcohols, optionally with C.sub.6 alcohol. Improved performance and formulation benefits are obtained.
    Type: Grant
    Filed: January 3, 1984
    Date of Patent: July 9, 1985
    Assignee: Lever Brothers Company
    Inventor: Appaya R. Naik
  • Patent number: 4137180
    Abstract: Fabric softening is provided by cationic diesters of the formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are each an alkyl or hydroxyalkyl group containing from 1 to 4 carbon atoms, or a benzyl group, R.sub.4 and R.sub.5 are each alkyl chains containing from 11 to 23 carbon atoms, and X.sup.- is a water soluble anion. Mixtures of these diesters with the corresponding monoesters are described together with preparative methods.
    Type: Grant
    Filed: July 1, 1977
    Date of Patent: January 30, 1979
    Assignee: Lever Brothers Company
    Inventors: Appaya R. Naik, Klaus H. Todt, Martin A. Wells