Patents by Inventor Albert Pfiffner

Albert Pfiffner 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).

  • 2,4-Dodecadienoic acid esters and use for insecticides
    Patent number: 3983247
    Abstract: The present invention relates to polyene compounds, a process for their preparation, pesticidal compositions containing same, and a method of providing a locus free from pests using said pesticides, alone or in composition.
    Type: Grant
    Filed: March 18, 1975
    Date of Patent: September 28, 1976
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Madhukar Subraya Chodnekar, Ulrich Schwieter, Peter Loeliger, Albert Pfiffner, Milos Suchy, Rene Zurfluh
  • Epithio compounds
    Patent number: 3983243
    Abstract: Epithio unsaturated aliphatic acids, nitriles, and alcohols and ether, ester and amide derivatives thereof and epoxy unsaturated aliphatic acids, nitriles and alcohols and ether ester and amide derivatives thereof, which are useful in killing and preventing proliferation of insects by upsetting their hormone balance.
    Type: Grant
    Filed: December 11, 1974
    Date of Patent: September 28, 1976
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Albert Pfiffner, Ulrich Schwieter
  • Propargyl esters of 7,11-substituted dodecadienoic acids
    Patent number: 3966780
    Abstract: Polyene esters, ethers, carbamates, thioesters, amides, carbonyls and nitriles, containing at least one pair of conjugated double bonds, which are useful in killing pests, such as insects, and preventing the proliferation of such pests by upsetting their hormonal balance.
    Type: Grant
    Filed: June 8, 1973
    Date of Patent: June 29, 1976
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Madhukar Subraya Chodnekar, Peter Loeliger, Albert Pfiffner, Ulrich Schwieter, Milos Suchy, Rene Zurfluh
  • Phenyl derivatives
    Patent number: 3957763
    Abstract: The present invention relates to phenyl derivatives, useful as insect hormones and with a method of providing a locus free of pests when using said phenyl derivatives or compositions containing same.
    Type: Grant
    Filed: March 6, 1975
    Date of Patent: May 18, 1976
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Madhukar Subraya Chodnekar, Ulrich Schwieter, Peter Loeliger, Albert Pfiffner, Milos Suchy, Rene Zurfluh
  • Process for the preparation of tridecadien derivatives
    Patent number: 3957729
    Abstract: A process for preparing 2-cis,6-trans-10,11-epoxy-6-ethyl-3,11-dimethyl-2,6-tridecadien derivatives and mixtures of said 2-cis,6-trans-tridecadienn derivatives with its corresponding 2-trans,6-trans-geometric isomers which are useful in killing and preventing proliferation of insects, by upsetting their hormone balance including intermediates in this process.
    Type: Grant
    Filed: December 5, 1968
    Date of Patent: May 18, 1976
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Frank Ratcliffe Atherton, Albert Pfiffner
  • Alkynyloxy-phenyl derivatives
    Patent number: 3957833
    Abstract: Alkynyl, benzyl or phenyl, ethers and esters which are ring substituted with an oxy or a thio aliphatic chain. These ethers and esters are useful in killing and preventing the proliferation of insects by upsetting their hormonal balance.
    Type: Grant
    Filed: February 10, 1975
    Date of Patent: May 18, 1976
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Madhukar Subraya Chodnekar, Albert Pfiffner, Norbert Rigassi, Ulrich Schwieter, Milos Suchy
  • Propynyl benzyl ethers
    Patent number: 3946040
    Abstract: Propynyl benzyl ethers having juvenile hormone-like activity which are 4-halogen, lower alkyl, lower alkoxy or propynyloxy substituted or 3,4-lower alkylenedioxy substituted and which can also be 3,5- and/or .alpha.-substituted, and insecticide compositions that include at least one propynyl benzyl ether and that can also include a conventional insect-poison.
    Type: Grant
    Filed: December 26, 1973
    Date of Patent: March 23, 1976
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Madhukar Subraya Chodnekar, Albert Pfiffner, Norbert Rigassi, Ulrich Schwieter, Milos Suchy
  • Phenyl derivatives
    Patent number: 3944531
    Abstract: Phenyloxy, phenylsulfinyl, phenylthio, phenylsulfonyl, benzyloxy, benzylthio, benzylsulfinyl, or benzylsulfonyl, alkyl or alkenyl derivatives wherein the alkyl or alkenyl group contains at least 7 carbon atoms which are useful in killing and preventing proliferation of insects by upsetting their hormone balance.
    Type: Grant
    Filed: April 20, 1970
    Date of Patent: March 16, 1976
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Madhukar Subraya Chodnekar, Albert Pfiffner, Norbert Rigassi, Ulrich Schwieter, Milos Suchy