Patents by Inventor Kurt Hofer

Kurt Hofer 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).

  • Publication number: 20050031417
    Abstract: A variety of devices capable of bringing ocean water from a considerable depth to the surface using airlift systems. A bubble of air released in the ocean will rise to the surface. If a gas diffuser is employed to release millions of bubbles of air, the rising cloud of bubbles will entrain the surrounding water and pull it toward the surface.
    Type: Application
    Filed: June 21, 2002
    Publication date: February 10, 2005
    Inventors: Kurt Hofer, John Colson
  • Patent number: 4308218
    Abstract: Aryl phosphonites and thiophosphonites of the formula, ##STR1## in which the or each R, independently, is alkyl, alkoxy, chlorine or dialkylamino, there being at the most one dialkylamino group, at the 4-position and unaccompanied by any other substituents, on the benzene nucleus,n is zero, 1, 2 or 3,each X, independently, is oxygen or sulphur,and each R.sub.1, independently, is alkyl or optionally substituted phenyl,are useful as antioxidants. Organic material, e.g. polypropylene, which are susceptible to the degradative effects of oxygen, are treated with one or more of such compounds, e.g. by incorporation into the body of the organic material, in order to be stabilized against such effects.
    Type: Grant
    Filed: May 29, 1980
    Date of Patent: December 29, 1981
    Assignee: Sandoz Ltd.
    Inventors: Kurt Hofer, Rudolf Moesch, Guenther Tscheulin
  • Patent number: 4211731
    Abstract: Fluorene phosphonites and thiophosphonites of the formula, ##STR1## in which each R, independently, is alkyl or optionally substituted phenyl, each Y, independently, is oxygen or sulphur, and n is zero or 1, are useful as antioxidants. Organic materials, which are susceptible to the degradative effects of oxygen, are treated with one or more of such compounds e.g. by incorporation into the body of the organic material, in order to be stabilized against such effects.
    Type: Grant
    Filed: September 11, 1978
    Date of Patent: July 8, 1980
    Assignee: Sandoz Ltd.
    Inventors: Kurt Hofer, Rudolf Moesch, Guenther Tscheulin
  • Patent number: 4206076
    Abstract: Novel compounds based on a hydroxybiphenyl nucleus in which the hydroxy group is in the para position relative to the other phenyl ring and has an adjacent tertiary alkyl radical, are useful stabilizers for organic compounds against heat, light or oxygen.
    Type: Grant
    Filed: November 28, 1977
    Date of Patent: June 3, 1980
    Assignee: Sandoz Ltd.
    Inventors: Kurt Hofer, Rudolf Moesch, Guenther Tscheulin, Anton Voykowitsch
  • Patent number: 4165267
    Abstract: The present invention concerns novel photopolymerizable formulations which comprise a photopolymerizable system in association with a photosensitizing amount of the compound of formula ##STR1## WHEREIN R is an unsubstituted or substituted binuclear aromatic group, e.g. phenoxy phenyl,M is 0, 1 or 2 andHal is halogen.
    Type: Grant
    Filed: March 6, 1973
    Date of Patent: August 21, 1979
    Assignee: Sandoz Ltd.
    Inventors: Lajos Avar, Kurt Hofer
  • Patent number: 4146540
    Abstract: The present invention concerns certain novel compounds falling under the general formula: ##STR1## WHEREIN R.sub.1, R.sub.2 and R.sub.3 are substituents, e.g. alkyl and Me is hydrogen or a metal cation.The compounds are useful stabilizers of organic material against the degradative effect of heat, oxidation and U.V. light.
    Type: Grant
    Filed: October 21, 1977
    Date of Patent: March 27, 1979
    Assignee: Sandoz Ltd.
    Inventors: Lajos Avar, Kurt Hofer, Martin Preiswerk
  • Patent number: 4107138
    Abstract: Organic materials are stabilized against the effects of heat, light or oxygen by addition of a compound of the formula ##STR1## WHEREIN X is --CH.sub.2 --, --O-- or -- S--,Y.sub.1, y.sub.2, y.sub.3 and Y.sub.4 are --O-- or --S--,R.sub.1, r.sub.2, r.sub.3 and R.sub.4 are hydrogen or hydrocarbon radicalsn is 0 or 1And rings A and B may be further substituted by 1 or 2 alkyl groupsOr an inorganic salt of such a compound in which any of R.sub.1 -R.sub.4 are hydrogen.
    Type: Grant
    Filed: May 8, 1975
    Date of Patent: August 15, 1978
    Assignee: Sandoz Ltd.
    Inventors: Kurt Hofer, Guenther Tscheulin
  • Patent number: 4102857
    Abstract: New ultraviolet light-absorbing compounds of the formula ##STR1## IN WHICH R.sub.1 is a substituent, e.g. alkyl,R.sub.2 is a substituent, e.g. alkyl,R.sub.3 is hydrogen or a substituent, e.g. alkyl,N is 1, 2 or 3, andR is an n-valent, optionally substituted benzene radical, or a 1- or 2-valent naphthalene or heterocyclic radical, which are producible by known processes. Such compounds are useful as stabilizers of organic materials, particularly plastics materials, against the degrading action of ultraviolet light and can be either applied as a coating on the organic material, or incorporated therein.Such compounds are useful as stabilizers of organic materials, particularly plastics materials, against the degrading action of ultraviolet light and can be either applied as a coating on the organic material, or incorporated therein.
    Type: Grant
    Filed: August 20, 1976
    Date of Patent: July 25, 1978
    Assignee: Sandoz Ltd.
    Inventors: Lajos Avar, Kurt Hofer, Martin Preiswerk
  • Patent number: 4075163
    Abstract: The purpose of the invention are new benzene phosphonous acid compounds in which two to four benzene nuclei are bound together and which contain one to three phosphorus atoms. The new compounds are free acids, their salts with inorganic cations, their esters, thioesters or amides. The invention concerns also the manufacture of these benzene phosphonous acid compounds and their use for the stabilization of organic materials.
    Type: Grant
    Filed: March 19, 1976
    Date of Patent: February 21, 1978
    Assignee: Sandoz Ltd.
    Inventors: Kurt Hofer, Guenther Tscheulin
  • Patent number: 4042632
    Abstract: New antistatic compounds of formula ##STR1## WHEREIN R.sub.1 is alkyl optionally interrupted by 1 or 2 S, SO or SO.sub.2 moieties or 1 COO moiety, any alkyl(ene) being optionally hydroxyl-substituted; cycloalkyl; alkylcycloalkyl; or a mono- or polyoxyalkylene group terminated by alkyl, optionally alkyl-substituted phenyl or phenylalkyl:,n is 1 or 2;m is an integer 1 to 7;R.sub.2 is (m + 1) valent alkylene optionally interrupted by 1 or 2 O, S, SO or SO.sub.2 moieties; bivalent benzene, cyclohexane, biphenyl, diphenyloxide, -sulphide, -sulphoxide, -sulphone or -methane, 2,2-diphenylpropane, bis-cyclohexylmethane or 2,2-bis-cyclohexylpropane, or a (m + 1) valent mono- or polyoxyalkylene group containing R.sub.2 ;and each R.sub.3, independently, has one of the meanings given for R.sub.1, or is hydrogen or phenyl, naphthyl or phenylalkyl optionally substituted on the aromatic nucleus; a group ##STR2## having the above meanings; or a group ##STR3## in which R.sub.
    Type: Grant
    Filed: August 6, 1975
    Date of Patent: August 16, 1977
    Assignee: Sandoz Ltd.
    Inventors: Kurt Hofer, Sr., Kurt Hofer, Jr.
  • Patent number: 4042562
    Abstract: The present invention concerns novel nitrogen-containing aromatic heterocyclic compounds of the formula: ##STR1## wherein R is a group of the formula ##STR2## wherein R.sub.1 and R.sub.2 are substituents, e.g. alkyl and R.sub.3 is hydrogen or a substituent, e.g. alkyl; R.sub.4 is a group R.sub.14 --X--, wherein R.sub.14 is a substituent, e.g. alkyl and X is --O--, --S-- or ##STR3## wherein R.sub.6 is hydrogen or a substituent, e.g. alkyl, or R.sub.4 is a heterocyclic ring or has one of the significances of R; R.sub.5 has one of the significances of R.sub.4 ; and Y is --N.dbd. or --CH.dbd..The compounds are useful as anti-oxidants in, e.g. plastics materials.
    Type: Grant
    Filed: October 6, 1975
    Date of Patent: August 16, 1977
    Assignee: Sandoz Ltd.
    Inventors: Kurt Hofer, Guenther Tscheulin
  • Patent number: 4036812
    Abstract: The present invention concerns novel nickel complexes (I) possessing U.V. stabilizing properties characterized by bearing per molecule 2 monodentate nickel coordinated 1,3-hydrocarbyl-4-(greater than C.sub.1)-acyl-pyrazole-5-oxy ligands and one bidentate or two monodentate nickel coordinated primary or secondary amine ligands, and their use as U.V. stabilizers for e.g. plastics materials.
    Type: Grant
    Filed: December 17, 1975
    Date of Patent: July 19, 1977
    Assignee: Sandoz Ltd.
    Inventors: Lajos Avar, Kurt Hofer
  • Patent number: 4033957
    Abstract: Triazine derivatives of formula ##STR1## in which R.sub.1 is a tertiary alkyl radical,R.sub.2 is hydrogen or a substituent, e.g. alkyl,n is 0 or an integer,R.sub.3 is --NH-- or --O--CH.sub.3 --.sub.mWherein m is an integer,X is --O--, --S-- or --NR.sub.6 --,wherein R.sub.6 is hydrogen or a substituent, e.g. alkyl or phenyl,R.sub.4 is one of the radicals signified by R.sub.6, or, when X is --NH--, a radical of formula ##STR2## R.sub.1, R.sub.2, n and R.sub.3 being as indicated above, OR R.sub.4, R.sub.6 and the common nitrogen atom, and optionally a further hetero atom, form a saturated 5- or 6-membered heterocyclic ring,And R.sub.5 is one of the radicals signified by --X--R.sub.4, or a substituent, e.g. alkyl,Are useful for stabilizing organic materials, e.g. polypropylene, against the degradative effects of oxygen, heat and/or light.
    Type: Grant
    Filed: December 3, 1974
    Date of Patent: July 5, 1977
    Assignee: Sandoz Ltd.
    Inventors: Kurt Hofer, Guenther Tscheulin
  • Patent number: 4029684
    Abstract: The present invention concerns novel 2-hydroxybenzophenone derivatives and metal complexes thereof of the formula: ##STR1## wherein Z.sub.1, Z.sub.2, Y.sub.1 and Y.sub.2 are each, independently, hydrogen or a substituent, at least one of Y.sub.1 and Y.sub.2 being a group ##STR2## wherein, R.sub.1 is alkyl R.sub.2 is hydrogen or a substituent andA is oxygen, sulphur or ##STR3## The compounds are useful for stabilizing organic material, e.g. plastics, against degradation under the influence of U.V. radiation.
    Type: Grant
    Filed: May 16, 1975
    Date of Patent: June 14, 1977
    Assignee: Sandoz Ltd.
    Inventors: Lajos Avar, Kurt Hofer
  • Patent number: 4008200
    Abstract: The present invention concerns a novel method of stabilizing organic material susceptible to degradation under the effect of heat, oxidation or ultra-violet light which comprises treating said material with a compound of the formula: ##STR1## WHEREIN R.sub.1, R.sub.2 and R.sub.3 are substituents, e.g. alkyl and Me is hydrogen or a metal cation.
    Type: Grant
    Filed: April 11, 1975
    Date of Patent: February 15, 1977
    Assignee: Sandoz Ltd.
    Inventors: Lajos Avar, Kurt Hofer, Martin Preiswerk
  • Patent number: 3976658
    Abstract: New ultraviolet light-absorbing compounds of the formula ##SPC1##In whichR.sub.1 is a substituent, e.g. alkyl,R.sub.2 is a substituent, e.g. alkyl,R.sub.3 is hydrogen or a substituents, e.g. alkyl,n is 1, 2 or 3, andR is an n-valent, optionally substituted benzene radical, or a 1- or 2-valent naphthalene or heterocyclic radical,Which are producible by known processes.Such compounds are useful as stabilizers of organic materials, particularly plastics materials, against the degrading action of ultraviolet light and can be either applied as a coating on the organic material, or incorporated therein.
    Type: Grant
    Filed: July 8, 1974
    Date of Patent: August 24, 1976
    Assignee: Sandoz Ltd.
    Inventors: Lajos Avar, Kurt Hofer, Martin Preiswerk
  • Patent number: 3975382
    Abstract: The present invention concerns novel pyrazole (5) pyrazolone (5) metal complexes of the formula ##SPC1##Wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are substituents and Me is a transition metal,Useful in stabilizing sensitive organic material against the degradative effect of U.V. light.
    Type: Grant
    Filed: March 14, 1975
    Date of Patent: August 17, 1976
    Assignee: Sandoz Ltd.
    Inventors: Lajos Avar, Kurt Hofer
  • Patent number: 3963737
    Abstract: 1,3-Dihydrocarbyl-pyrazole compounds, having a 5-hydroxyl group in free or nickel salt form, characterized by a ketoxyimino group bound directly to the 4-position of the pyrazole ring through the ketoxyimino functional carbon atom, which are useful as stabilizers of organic materials against the adverse effects of ultraviolet light.
    Type: Grant
    Filed: July 2, 1975
    Date of Patent: June 15, 1976
    Assignee: Sandoz Ltd.
    Inventors: Lajos Avar, Kurt Hofer
  • Patent number: 3962175
    Abstract: The purpose of the invention are new benzene phosphonous acid compounds in which two to four benzene nuclei are bound together and which contain one to three phosphorus atoms. The new compounds are free acids, their salts with inorganic cations, their esters, thioesters or amides. The invention concerns also the manufacture of these benzene phosphonous acid compounds and their use for the stabilization of organic materials.
    Type: Grant
    Filed: April 25, 1974
    Date of Patent: June 8, 1976
    Assignee: Sandoz Ltd.
    Inventors: Kurt Hofer, Guenther Tscheulin
  • Patent number: D304683
    Type: Grant
    Filed: February 19, 1986
    Date of Patent: November 21, 1989
    Inventor: Kurt Hofer