Patents by Inventor Stephen Boothroyd

Stephen Boothroyd 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: 5250289
    Abstract: A sunscreening composition which comprises a water-in-oil emulsion which comprises a) 0.5 to 30% by weight of titanium dioxide having a mean primary particle size of less than 100 nm, b) 5 to 20% by weight of an oil phase, c) 1 to 15% by weight of an emulsifier, and d) at least 40% by weight of an aqueous phase. The titanium dioxide may be coated with aluminium stearate. Further sunscreening agents may be included. The oil phase may be a hydrocarbon oil, a wax, a natural oil, a silicone oil or a mixture. Preferred emulsifiers are sesquioleates such as polyglyceryl-2-sesquioleate or sorbitan sesquioleate, polyethoxylated esters of derivatives of natural oils such as polyethoxylated esters of hydrogenated castor oil or silicone emulsifiers such as silicone polyols.
    Type: Grant
    Filed: January 11, 1990
    Date of Patent: October 5, 1993
    Assignee: The Boots Company PLC
    Inventors: Stephen Boothroyd, Edward Galley, Arija M. Stammers
  • Patent number: 4981682
    Abstract: A depilatory composition comprising a depilatory compound, in particular potassium thioglycolate, and a tertiary amine of general formula INR.sub.1 R.sub.2 R.sub.3 Iwherein R.sub.1 represents a long chain fatty moiety having 8 to 36 carbon atoms and R.sub.2 and R.sub.3 each independently represent a fatty moiety having 1 to 36 carbon atoms. The composition has pH of between 11.5 and 12.7. The softening effect of the tertiary amine avoids the growth of stiff stubble and does not reduce the efficacy of the depilatory compound.
    Type: Grant
    Filed: March 9, 1990
    Date of Patent: January 1, 1991
    Assignee: The Boots Company PLC
    Inventors: Stephen Boothroyd, Christine Sheard