Patents by Inventor Urs Sollberger

Urs Sollberger 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).

  • Organic compounds
    Patent number: 4035448
    Abstract: The present invention relates to phosphorus containing compounds and more specifically to phosphorous and phosphoric acid esters of the formula, ##STR1## wherein R.sub.1 and R.sub.2 are each hydrogen or alkyl,n is an integer 1 or 2, andY is a mono or divalent aromatic radical.The compounds are useful as flame retardants for, e.g., plastics materials.
    Type: Grant
    Filed: April 7, 1975
    Date of Patent: July 12, 1977
    Assignee: Sandoz Ltd.
    Inventors: Horst Mayerhoefer, Wolfgang Mueller, Urs Sollberger, Rainer Wolf
  • Boric acid esters
    Patent number: 4021464
    Abstract: The invention provides novel boric acid esters, useful as flame retardants.
    Type: Grant
    Filed: March 7, 1975
    Date of Patent: May 3, 1977
    Assignee: Sandoz Ltd.
    Inventors: Horst Mayerhoefer, Wolfgang Mueller, Urs Sollberger
  • Bromo-propanol derivatives as flame retardants
    Patent number: 3962246
    Abstract: The present invention concerns a novel method of flame-proofing flammable material which comprises treating said material with a compound of the formula: ##EQU1## WHEREIN N IS 1 OR 2, AND R, when n is 1, is a radical of the formula ##EQU2## wherein R.sub.1 and R.sub.2 are substituents e.g. alkyl, or R.sub.1 and R.sub.2, together with the nitrogen atom, form a heterocyclic ring or R, when n is 2, is a radical of the formula ##EQU3## wherein R.sub.1 and R.sub.4 are substituents e.g. alkyl and R.sub.3 is a hydrocarbon bridge e.g. alkylene, or R.sub.1, R.sub.2 and R.sub.4, together with the nitrogen atoms to which they are bound, form a heterocyclic ring, or a group of the formula ##SPC1##Wherein m is 1 to 5, and novel compounds (i.e. when n is 2) useful as flame-proofing agents.
    Type: Grant
    Filed: July 19, 1974
    Date of Patent: June 8, 1976
    Assignee: Sandoz Ltd.
    Inventors: Peter Borer, Hans-Werner Finck, Horst Mayerhoefer, Urs Sollberger, Wolfgang Heinz Mueller
  • N,N'-(polybromophenoxycarbonyl)piperazines
    Patent number: 3954770
    Abstract: Flame retarding compounds of formula, ##SPC1##In whichEach n, independently, is an integer 2 to 5, andR is a divalent radical of formula ##EQU1## wherein R.sub.1 is alkylene or arylene and eachR.sub.2, independently, is alkyl or phenyl,For incorporation in organic materials such as plastics materials.
    Type: Grant
    Filed: October 31, 1974
    Date of Patent: May 4, 1976
    Assignee: Sandoz Ltd.
    Inventors: Horst Mayerhoefer, Wolfgang Mueller, Urs Sollberger, Anton Voykowitsch