Patents by Inventor Ursus Themmler

Ursus Themmler 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).

  • Phlegmatized red phosphorus
    Patent number: 4985221
    Abstract: Phlegmatized, pulverulent red phosphorus with good free-flowing properties comprises 95 to 99.95% by weight of red phosphorus having a particle size of up to 2 mm, and 0.05 to 5% by weight of polyurethane as phlegmatization agent.This red phosphorus is prepared by introducing an aqueous polyurethane dispersion into an aqueous suspension of red phosphorus having a particle size of up to 2 mm, after a pH of from 5 to 9 has been set, in a manner such that 5 to 0.05 parts by weight of polyurethane are present per 95 to 99.95 parts by weight of red phosphorus, then stirring the mixture at a temperature of from 20 to 90.degree. C. for 0.5 to 3 hours, and finally drying the phlegmatized red phosphorus at elevated temperature after filtration.
    Type: Grant
    Filed: February 2, 1990
    Date of Patent: January 15, 1991
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Horst Staendeke, Ursus Themmler