Patents by Inventor Brian Holt

Brian Holt 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).

  • Piperidine derivatives
    Patent number: 4046737
    Abstract: New 1- and 4-substituted piperidines are stabilizers for organic material. They are produced by reacting corresponding 1-substituted piperidinols with acid chlorides or corresponding 4-substituted piperidines with a compound introducing into the 1-position a residue.
    Type: Grant
    Filed: May 14, 1975
    Date of Patent: September 6, 1977
    Assignee: Ciba-Geigy Corporation
    Inventors: Brian Holt, Donald Richard Randell
  • Piperidine derivatives
    Patent number: 4021432
    Abstract: New 1- and 4-substituted piperidines are stabilizers for organic material. They are produced by reacting corresponding 1-substituted piperidinols with acid chlorides or corresponding 4-substituted piperidines with a compound introducing into the 1-position a residue.
    Type: Grant
    Filed: May 14, 1975
    Date of Patent: May 3, 1977
    Assignee: Ciba-Geigy Corporation
    Inventors: Brian Holt, Donald Richard Randell
  • Substituted piperidin-4-ols
    Patent number: 4014887
    Abstract: Disclosed are stabilized compositions comprising a polymer, especially polyolefines, and a minor proportion of a 1,2,2,6,6-pentasubstituted piperidin-4-ol. The new compositions possess good light stability.
    Type: Grant
    Filed: October 19, 1973
    Date of Patent: March 29, 1977
    Assignee: Ciba-Geigy Corporation
    Inventors: Donald Richard Randell, Brian Holt, Alan Geoffrey Virgin
  • Azine derivatives of piperidine
    Patent number: 3994857
    Abstract: New azine derivatives of piperidine are stabilizers for organic materials. They are produced by reacting the corresponding piperidones with hydrazine hydrate.
    Type: Grant
    Filed: September 16, 1974
    Date of Patent: November 30, 1976
    Assignee: Ciba-Geigy Corporation
    Inventor: Brian Holt
  • Esters of piperidinols
    Patent number: 3992390
    Abstract: New alkyl substituted p-hydroxy aryl esters and alkyl substituted p-hydroxy aralkyl esters of 2,2,6,6-tetrasubstituted piperidin-4-ols are used as stabilizers for organic materials, especially for polymers.
    Type: Grant
    Filed: June 3, 1974
    Date of Patent: November 16, 1976
    Inventors: Brian Holt, Donald Richard Randell