Patents Examined by Tim A. Saunder
  • Writing fluid
    Patent number: 5066329
    Abstract: In order to delay the drying of an aqueous writing fluid at an exposed point of a writing utensil, an ether is added to the aqueous writing fluid, the ether having a polyglycol radical and a single alcohol radical whose gel point is above 30.degree. Celsius and which is dispersed in the writing fluid. An example of such an ether is cetyl alcohol-n-polyglycol ether with n=5 or 6.
    Type: Grant
    Filed: October 1, 1990
    Date of Patent: November 19, 1991
    Assignee: J. S. Staedtler GmbH & Co.
    Inventors: Werner Schmickl, Roland Meichsner