Patents by Inventor Zahra Arghavani

Zahra Arghavani 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).

  • Patent number: 6891057
    Abstract: Novel compounds comprising a C—C double bond substituted at one carbon with two oxygen or sulfur atom-containing groups are disclosed. The compounds are useful in methods and compositions for generating chemiluminescence by reaction with a peroxidase enzyme and a peroxide. The chemiluminescence thus produced can be used as a detectable signal in assays for peroxidase enzymes and in assays employing enzyme-labeled specific binding pairs.
    Type: Grant
    Filed: January 9, 2004
    Date of Patent: May 10, 2005
    Assignee: Lumigen, Inc.
    Inventors: Hashem Akhavan-Tafti, Zahra Arghavani, Renuka DeSilva
  • Publication number: 20040144948
    Abstract: Novel compounds comprising a C—C double bond substituted at one carbon with two oxygen or sulfur atom-containing groups are disclosed. The compounds are useful in methods and compositions for generating chemiluminescence by reaction with a peroxidase enzyme and a peroxide. The chemiluminescence thus produced can be used as a detectable signal in assays for peroxidase enzymes and in assays employing enzyme-labeled specific binding pairs.
    Type: Application
    Filed: January 9, 2004
    Publication date: July 29, 2004
    Inventors: Hashem Akhavan-Tafti, Zahra Arghavani, Renuka DeSilva
  • Patent number: 6696569
    Abstract: Novel compounds comprising a C—C double bond substituted at one carbon with two oxygen or sulfur atom-containing groups are disclosed. The compounds are useful in methods and compositions for generating chemiluminescence by reaction with a peroxidase enzyme and a peroxide. The chemiluminescence thus produced can be used as a detectable signal in assays for peroxidase enzymes and in assays employing enzyme-labeled specific binding pairs.
    Type: Grant
    Filed: April 11, 2001
    Date of Patent: February 24, 2004
    Assignee: Lumigen, Inc.
    Inventors: Hashem Akhavan-Tafti, Zahra Arghavani, Renuka DeSilva
  • Patent number: 6635437
    Abstract: Novel heterocyclic compounds which generate chemiluminescence on reaction with a phosphatase enzyme are provided as well as a process for their preparation and intermediates useful therein. The compounds comprise a nitrogen, oxygen or sulfur-containing heterocyclic ring system bearing an exocyclic carbon—carbon double bond. The double bond is further substituted at the distal carbon with a phosphate group and an oxygen or sulfur atom-containing group. Novel compositions further comprising a cationic aromatic compound (CAC) in addition to the heterocyclic phosphate compound are provided. The addition of the CAC in the composition greatly increases the production of chemiluminescence and provides improved detection sensitivity. Compositions further comprising an anionic surfactant and a non-ionic surfactant provide additional improvements in detection sensitivity.
    Type: Grant
    Filed: January 22, 2002
    Date of Patent: October 21, 2003
    Assignee: Lumigen, Inc.
    Inventors: Hashem Akhavan-Tafti, Zahra Arghavani, Renuka DeSilva
  • Publication number: 20030023089
    Abstract: Novel heterocyclic compounds which generate chemiluminescence on reaction with a phosphatase enzyme are provided as well as a process for their preparation and intermediates useful therein. The compounds comprise a nitrogen, oxygen or sulfur-containing heterocyclic ring system bearing an exocyclic carbon-carbon double bond. The double bond is further substituted at the distal carbon with a phosphate group and an oxygen or sulfur atom-containing group.
    Type: Application
    Filed: January 22, 2002
    Publication date: January 30, 2003
    Inventors: Hashem Akhavan-Tafti, Zahra Arghavani, Renuka DeSilva
  • Patent number: 6410751
    Abstract: Stable, enzymatically triggered chemiluminescent 1,2-dioxetanes with improved water solubility and storage stability are provided as well as synthetic processes and intermediates used in their preparation. Dioxetanes further substituted with two or more water-solubilizing groups disposed on the dioxetane structure and an additional fluorine atom or lower alkyl group provide superior performance by eliminating the problem of reagent carryover when used in assays performed on capsule chemistry analytical systems. These dioxetanes display substantially improved stability on storage. Compositions comprising these dioxetanes, a non-polymeric cationic surfactant enhancer and optionally a fluorescer, for providing enhanced chemiluminescence are also provided.
    Type: Grant
    Filed: April 20, 2001
    Date of Patent: June 25, 2002
    Assignee: Lumigen, Inc.
    Inventors: Hashem Akhavan-Tafti, Renuka DeSilva, Kumar Thakur, Zahra Arghavani
  • Patent number: 6353129
    Abstract: Stable, enzymatically triggered chemiluminescent 1,2-dioxetanes with improved water solubility and storage stability are provided as well as synthetic processes and intermediates used in their preparation. Dioxetanes further substituted with two or more water-solubilizing groups disposed on the dioxetane structure and an additional fluorine atom or lower alkyl group provide superior performance by eliminating the problem of reagent carryover when used in assays performed on capsule chemistry analytical systems. These dioxetanes display substantially improved stability on storage. Compositions comprising these dioxetanes, a non-polymeric cationic surfactant enhancer and optionally a fluorescer, for providing enhanced chemiluminescence are also provided.
    Type: Grant
    Filed: April 20, 2001
    Date of Patent: March 5, 2002
    Assignee: Lumigen, Inc.
    Inventors: Hashem Akhavan-Tafti, Renuka DeSilva, Kumar Thakur, Zahra Arghavani
  • Publication number: 20020019553
    Abstract: Stable, enzymatically triggered chemiluminescent 1,2-dioxetanes with improved water solubility and storage stability are provided as well as synthetic processes and intermediates used in their preparation. Dioxetanes further substituted with two or more water-solubilizing groups disposed on the dioxetane structure and an additional fluorine atom or lower alkyl group provide superior performance by eliminating the problem of reagent carryover when used in assays performed on capsule chemistry analytical systems. These dioxetanes display substantially improved stability on storage. Compositions comprising these dioxetanes, a non-polymeric cationic surfactant enhancer and optionally a fluorescer, for providing enhanced chemiluminescence are also provided.
    Type: Application
    Filed: April 20, 2001
    Publication date: February 14, 2002
    Inventors: Hashem Akhavan-Tafti, Renuka DeSilva, Kumar Thakur, Zahra Arghavani
  • Publication number: 20010039345
    Abstract: Novel compounds comprising a C—C double bond substituted at one carbon with two oxygen or sulfur atom-containing groups are disclosed. The compounds are useful in methods and compositions for generating chemiluminescence by reaction with a peroxidase enzyme and a peroxide. The chemiluminescence thus produced can be used as a detectable signal in assays for peroxidase enzymes and in assays employing enzyme-labeled specific binding pairs.
    Type: Application
    Filed: April 11, 2001
    Publication date: November 8, 2001
    Inventors: Hashem Akhavan-Tafti, Zahra Arghavani, Renuka DeSilva
  • Patent number: 6296787
    Abstract: Novel heterocyclic compounds which generate chemiluminescence on reaction with a phosphatase enzyme are provided as well as a process for their preparation and intermediates useful therein. The compounds comprise a nitrogen, oxygen or sulfur-containing heterocyclic ring system bearing an exocyclic carbon—carbon double bond. The double bond is further substituted at the distal carbon with a phosphate group and an oxygen or sulfur atom-containing group. Novel compositions further comprising a cationic aromatic compound (CAC) in addition to the heterocyclic phosphate compound are provided. The addition of the CAC in the composition greatly increases the production of chemiluminescence and provides improved detection sensitivity. Compositions further comprising an anionic surfactant and a non-ionic surfactant provide additional improvements in detection sensitivity.
    Type: Grant
    Filed: April 26, 2000
    Date of Patent: October 2, 2001
    Assignee: Lumigen, Inc.
    Inventors: Hashem Akhavan-Tafti, Zahra Arghavani, Renuka DeSilva
  • Patent number: 6270695
    Abstract: Novel heterocyclic compounds which generate chemiluminescence on reaction with a phosphatase enzyme are provided as well as a process for their preparation and intermediates useful therein. The compounds comprise a nitrogen, oxygen or sulfur-containing heterocyclic ring system bearing an exocyclic carbon-carbon double bond. The double bond is further substituted at the distal carbon with a phosphate group and an oxygen or sulfur atom-containing group. Novel compositions further comprising a cationic aromatic compound (CAC) in addition to the heterocyclic phosphate compound are provided. The addition of the CAC in the composition greatly increases the production of chemiluminescence and provides improved detection sensitivity. Compositions further comprising an anionic surfactant and a non-ionic surfactant provide additional improvements in detection sensitivity.
    Type: Grant
    Filed: July 21, 1999
    Date of Patent: August 7, 2001
    Assignee: Lumigen, Inc.
    Inventors: Hashem Akhavan-Tafti, Zahra Arghavani, Renuka DeSilva
  • Patent number: 6245928
    Abstract: Stable, enzymatically triggered chemiluminescent 1,2-dioxetanes with improved water solubility and storage stability are provided as well as synthetic processes and intermediates used in their preparation. Dioxetanes further substituted with two or more water-solubilizing groups disposed on the dioxetane structure and an additional fluorine atom or lower alkyl group provide superior performance by eliminating the problem of reagent carryover when used in assays performed on capsule chemistry analytical systems. These dioxetanes display substantially improved stability on storage. Compositions comprising these dioxetanes, a non-polymeric cationic surfactant enhancer and optionally a fluorescer, for providing enhanced chemiluminescence are also provided.
    Type: Grant
    Filed: February 17, 2000
    Date of Patent: June 12, 2001
    Assignee: Lumigen, Inc.
    Inventors: Zahra Arghavani, Hashem Akhavan-Tafti, Renuka DeSilva, Kumar Thakur
  • Patent number: 6218137
    Abstract: Novel heterocyclic compounds which generate chemiluminescence on reaction with a phosphatase enzyme are provided as well as a process for their preparation and intermediates useful therein. The compounds comprise a nitrogen, oxygen or sulfur-containing heterocyclic ring system bearing an exocyclic carbon-carbon double bond. The double bond is further substituted at the distal carbon with a phosphate group and an oxygen or sulfur atom-containing group. Novel compositions further comprising a cationic aromatic compound (CAC) in addition to the heterocyclic phosphate compound are provided. The addition of the CAC in the composition greatly increases the production of chemiluminescence and provides improved detection sensitivity. Compositions further comprising an anionic surfactant and a non-ionic surfactant provide additional improvements in detection sensitivity.
    Type: Grant
    Filed: March 31, 2000
    Date of Patent: April 17, 2001
    Assignee: Lumigen, Inc.
    Inventors: Hashem Akhavan-Tafti, Zahra Arghavani, Renuka DeSilva
  • Patent number: 6139782
    Abstract: Novel heterocyclic compounds which generate chemiluminescence on reaction with a phosphatase enzyme are provided as well as a process for their preparation and intermediates useful therein. The compounds comprise a nitrogen, oxygen or sulfur-containing heterocyclic ring system bearing an exocyclic carbon-carbon double bond. The double bond is further substituted at the distal carbon with a phosphate group and an oxygen or sulfur atom-containing group.Novel compositions further comprising a cationic aromatic compound (CAC) in addition to the heterocyclic phosphate compound are provided. The addition of the CAC in the composition greatly increases the production of chemiluminescence and provides improved detection sensitivity. Compositions further comprising an anionic surfactant and a non-ionic surfactant provide additional improvements in detection sensitivity.
    Type: Grant
    Filed: July 21, 1999
    Date of Patent: October 31, 2000
    Assignee: Lumigen, Inc.
    Inventors: Hashem Akhavan-Tafti, Zahra Arghavani, Renuka DeSilva
  • Patent number: 6090571
    Abstract: Novel heterocyclic compounds which generate chemiluminescence on reaction with a phosphatase enzyme are provided as well as a process for their preparation and intermediates useful therein. The compounds comprise a nitrogen, oxygen or sulfur-containing heterocyclic ring system bearing an exocyclic carbon-carbon double bond. The double bond is further substituted at the distal carbon with a phosphate group and an oxygen or sulfur atom-containing group.Novel compositions further comprising a cationic aromatic compound (CAC) in addition to the heterocyclic phosphate compound are provided. The addition of the CAC in the composition greatly increases the production of chemiluminescence and provides improved detection sensitivity. Compositions further comprising an anionic surfactant and a non-ionic surfactant provide additional improvements in detection sensitivity.
    Type: Grant
    Filed: July 21, 1999
    Date of Patent: July 18, 2000
    Assignee: Lumigen, Inc.
    Inventors: Hashem Akhavan-Tafti, Zahra Arghavani, Renuka DeSilva
  • Patent number: 6045727
    Abstract: Novel heterocyclic compounds which generate chemiluminescence on reaction with a phosphatase enzyme are provided as well as a process for their preparation and intermediates useful therein. The compounds comprise a nitrogen, oxygen or sulfur-containing heterocyclicring system bearing an exocyclic carbon-carbon double bond. The double bond is further substituted at the distal carbon with a phosphate group and an oxygen or sulfur atom-containing group. Novel compositions further comprising a cationic aromatic compound (CAC) in addition to the heterocyclic phosphate compound are provided. The addition of the CAC in the composition greatly increases the production of chemiluminescence and provides improved detection sensitivity. Compositions further comprising an anionic surfactant and a non-ionic surfactant provide additional improvements in detection sensitivity.
    Type: Grant
    Filed: August 13, 1997
    Date of Patent: April 4, 2000
    Assignee: Lumigen, Inc.
    Inventors: Hashem Akhavan-Tafti, Zahra Arghavani, Renuka DeSilva
  • Patent number: 6036892
    Abstract: Stable, enzymatically triggered chemiluminescent 1,2-dioxetanes with improved water solubility and storage stability are provided as well as synthetic processes and intermediates used in their preparation. Dioxetanes further substituted with two or more water-solubilizing groups disposed on the dioxetane structure and an additional fluorine atom or lower alkyl group provide superior performance by eliminating the problem of reagent carryover when used in assays performed on capsule chemistry analytical systems. These dioxetanes display substantially improved stability on storage. Compositions comprising these dioxetanes, a non-polymeric cationic surfactant enhancer and optionally a fluorescer, for providing enhanced chemiluminescence are also provided.
    Type: Grant
    Filed: July 7, 1998
    Date of Patent: March 14, 2000
    Assignee: Lumigen, Inc.
    Inventors: Zahra Arghavani, Hashem Akhavan-Tafti, Renuka DeSilva, Kumar Thakur
  • Patent number: 5936101
    Abstract: A process for producing a stable triggerable dioxetane comprising;(a) reacting a vinyl sulfide compound containing a sulfur-substituent SR.sub.4, wherein R.sub.4 is an organic group containing 1 to 20 carbon atoms and optionally heteroatoms, with oxygen and light in the presence of a photosensitizer to form an intermediate sulfur-substituted dioxetane compound; and(b) reacting the sulfur-substituted dioxetane compound with an electrophilic compound E--Y and a hydroxylic compound R.sub.5 OH selected from the group consisting of alcohols, phenols and carboxylic acids or their salts and containing an OR.sub.5 group to replace the SR.sub.4 group of the dioxetane with the OR.sub.5 group.
    Type: Grant
    Filed: December 22, 1997
    Date of Patent: August 10, 1999
    Assignee: Lumigen, Inc.
    Inventors: Hashem Akhavan-Tafti, Zahra Arghavani, Robert A. Eickholt
  • Patent number: 5883287
    Abstract: Vinyl sulfides bearing protected arlyoxy substituents and a process for their preparation are provided. In the process a vinyl sulfide is formed by coupling a ketone compound and a thioester compound with a low valent titanium reagent to form both carbon-carbon bonds in the same step. The vinyl sulfide compounds are useful as intermediates which are convertible into triggerable sulfur-substituted dioxetanes by addition of oxygen to the double bond. The sulfur-substituted dioxetanes additionally are useful for producing chemiluminescence or for further conversion into triggerable alkoxy, alkenyloxy, alkynloxy, aryloxy, aralkyloxy, or acyloxy-substituted dioxetanes. Triggerable dioxetanes are useful for producing chemiluminescence and in detecting activating agents in assays such as immunoassays and nucleic acid hybridization assays.
    Type: Grant
    Filed: December 22, 1997
    Date of Patent: March 16, 1999
    Assignee: Lumigen, Inc.
    Inventors: Hashem Akhavan-Tafti, Zahra Arghavani, Robert A. Eickholt
  • Patent number: 5866045
    Abstract: Stable, enzymatically triggered chemiluminescent 1,2-dioxetanes with improved water solubility and storage stability are provided. Dioxetanes further substituted with two or more water-solubilizing groups disposed on the dioxetane structure and an additional fluorine atom or lower alkyl group provide superior performance by eliminating the problem of reagent carryover when used in assays performed on capsule chemistry analytical systems. These dioxetanes display substantially improved stability on storage. Compositions comprising these dioxetanes, a non-polymeric cationic surfactant enhancer and optionally a fluorescer, for providing enhanced chemiluminescence are also provided.
    Type: Grant
    Filed: July 17, 1997
    Date of Patent: February 2, 1999
    Assignee: Lumigen, Inc.
    Inventors: Hashem Akhavan-Tafti, Zahra Arghavani, Renuka DeSilva, Kumar Thakur