Patents by Inventor Prithipal Singh

Prithipal Singh 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: 4489156
    Abstract: Chloramphenicol derivatives are provided for use in the preparing of antigen conjugates for the production of antibodies specifically for chloramphenicol. Specifically, the aryl amino group is derivatized to introduce a non-oxocarbonyl group which is used for amide formation with an antigen. The conjugate is then injected into a vertebrate for production of antisera which is isolated in conventional ways and find particular use in competitive protein binding assays.
    Type: Grant
    Filed: April 23, 1981
    Date of Patent: December 18, 1984
    Assignee: Syva Company
    Inventors: Pyare Khanna, Evan S. Snyder, Prithipal Singh
  • Patent number: 4489157
    Abstract: Chloramphenicol derivatives are provided for use in the preparing of antigen conjugates for the production of antibodies specifically for chloramphenicol. Specifically, the aryl amino group is derivatized to introduce a non-oxocarbonyl group which is used for amide formation with an antigen. The conjugate is then injected into a vertebrate for production of antisera which is isolated in conventional ways and finds particular use in competitive protein binding assays.
    Type: Grant
    Filed: September 28, 1981
    Date of Patent: December 18, 1984
    Assignee: Syva Company
    Inventors: Pyare L. Khanna, Evan S. Snyder, Prithipal Singh
  • Patent number: 4446065
    Abstract: Novel oxime derivatives of phencyclidine are provided as precursors for conjugating proteins, either antigenic for the preparation of antibodies or enzymatic for the preparation of enzyme conjugates, which antibodies and enzyme conjugates find use as reagents in immunoassays. The combination of antibodies and enzyme conjugates provide for sensitive, accurate, rapid assays for phencyclidine without interference from commonly administered drugs, such as dextromethorphan, demerol and chlorpromazine.
    Type: Grant
    Filed: December 22, 1981
    Date of Patent: May 1, 1984
    Assignee: Syva Company
    Inventors: Cheng-I Lin, Prithipal Singh
  • Patent number: 4409325
    Abstract: .alpha.-substituted derivatives of valproic acid are provided for conjugation to antigenic compositions, particularly poly(amino acids), and enzymes. The antigenic conjugates are employed for the production of antibodies, which find particular use in immunoassays for the determination of valproate, while the enzyme conjugate finds use in a homogeneous enzyme immunoassay for the determination of valproate. The compounds are synthesized by alkylating valproate at the tertiary carbon atom by an aliphatic chain with a terminal double bond which is cleaved to provide an acid or aldehyde group.
    Type: Grant
    Filed: December 21, 1981
    Date of Patent: October 11, 1983
    Assignee: Syva Company
    Inventors: Danton K. Leung, Prithipal Singh
  • Patent number: 4329502
    Abstract: Compounds are provided which can be used in the preparation of reagents useful for quantitatively determining the presence of b-adrenergic blocking agents. These compounds contain a derivative of the blocking agent which is linked to an antigen or enzyme, the antigen conjugates being useful for preparing antibodies, and the enzyme conjugates being useful as detectors in an immunoassay as well. Additionally carboxylic acids, esters and aldehydes which are derivatives of the blocking agents are provided which are useful in preparing the above conjugates.
    Type: Grant
    Filed: August 7, 1980
    Date of Patent: May 11, 1982
    Assignee: Syva Company
    Inventors: Prithipal Singh, Marcel R. Pirio
  • Patent number: 4328311
    Abstract: Methods and compositions are provided for conjugating a wide variety of compounds, particularly polyfunctional compounds, having a mercapto group, either naturally present or synthetically introduced, to a polyamino compound, particularly a polypeptide (including proteins). The method employs a haloalkyl-carbonyl compound, which is conjugated to one or more of the amino groups under mild acylating conditions. This is followed by combining the acylated polyamino compound with a mercapto containing compound, whereby the halogen is displaced by the sulfur of the mercapto group to form a stable thioether linkage. The resulting conjugates, depending on the compounds involved, can find uses in immunoassays, as hapten-antigen conjugates for the production of antibodies, and as ligand analog enzyme conjugates for use as reagents in controlling the distribution of substitution of a mercapto compound to a polyamino compound.
    Type: Grant
    Filed: February 28, 1980
    Date of Patent: May 4, 1982
    Assignee: Syva Company
    Inventors: Gerald L. Rowley, Danton Leung, Prithipal Singh
  • Patent number: 4323507
    Abstract: .alpha.-substituted derivatives of valproic acid are provided for conjugation to antigenic compositions, particularly poly(amino acids), and enzymes. The antigenic conjugates are employed for the production of antibodies, which find particular use in immunoassays for the determination of valproate, while the enzyme conjugate finds use in a homogeneous enzyme immunoassay for the determination of valproate. The compounds are synthesized by alkylating valproate at the tertiary carbon atom by an aliphatic chain with a terminal double bond which is cleaved to provide an acid or aldehyde group.
    Type: Grant
    Filed: July 14, 1980
    Date of Patent: April 6, 1982
    Assignee: Syva Company
    Inventors: Danton K. Leung, Prithipal Singh
  • Patent number: 4307245
    Abstract: Amitriptyline functionalized compounds are provided for conjugation to antigenic compositions, particularly poly(amino acids), and enzymes. The antigenic conjugates are employed for the production of antibodies, which find particular use in immunoassays for the determination of amitriptyline, while the enzyme conjugate finds use in a homogeneous enzyme immunoassay for the determination of amitriptyline.
    Type: Grant
    Filed: April 7, 1980
    Date of Patent: December 22, 1981
    Assignee: Syva Company
    Inventors: Mae W. Hu, Prithipal Singh
  • Patent number: 4288553
    Abstract: Novel carboxyalkylated disopyramides (NORPACE.RTM.) are provided as precursors for conjugating proteins, either antigenic for the preparation of antibodies or enzymatic for the preparation of enzyme conjugates, which antibodies and enzyme conjugates find use as reagents in immunoassays. The combination of antibodies and enzyme conjugates provide for sensitive, accurate, rapid assays for disopyramide without interference from closely analogous compounds, such as methadone or disopyramides metabolites.
    Type: Grant
    Filed: February 11, 1980
    Date of Patent: September 8, 1981
    Assignee: Syva Company
    Inventors: Prithipal Singh, Pyare L. Khanna, Floyd W. Colvin
  • Patent number: 4281065
    Abstract: Phencylidine, PCP, derivatives having a non-oxo carbonyl functionality linked directly or through a linking group to the phenyl ring are provided for conjugation to antigenic compositions, particularly poly(amino acids), and enzymes. The antigenic conjugates are employed for the production of antibodies, which find particular use in immunoassays for the determination of phencyclidine, while the enzyme conjugate finds use in a homogeneous enzyme immunoassay for the determination of phencyclidine.
    Type: Grant
    Filed: January 25, 1979
    Date of Patent: July 28, 1981
    Assignee: Syva Company
    Inventors: Cheng-I Lin, Prithipal Singh
  • Patent number: 4275160
    Abstract: Imipramine functionalized compounds are provided for conjugation to antigenic compounds, particularly poly(amino acids), and enzymes. The antigenic conjugates are employed for the production of antibodies, which find particular use in immunoassays for the determination of imipramine, while the enzyme conjugate finds use in a homogeneous enzyme assay for the determination of imipramine.
    Type: Grant
    Filed: July 6, 1979
    Date of Patent: June 23, 1981
    Assignee: Syva Company
    Inventors: Prithipal Singh, Marcel R. Pirio
  • Patent number: 4262089
    Abstract: Theophylline derivatives are provided for preparing reagents for use in competitive protein binding assays and for use as reagents in competitive protein binding assays. Theophylline is substituted at the 3 position and conjugated to antigens for production of antibodies which specifically recognize theophylline as distinct from structurally similar analogs such as caffeine. Enzyme conjugates are provided which find use for measuring the amount of theophylline in a sample suspected of containing theophylline. A method is provided employing the reagents for the determination of theophylline.
    Type: Grant
    Filed: April 7, 1980
    Date of Patent: April 14, 1981
    Assignee: Syva Company
    Inventors: Prithipal Singh, Mae W. Hu
  • Patent number: 4241177
    Abstract: Compounds are provided which can be used in the preparation of reagents useful for quantitatively determining the presence of .beta.-adrenergic blocking agents. These compounds contain a derivative of the blocking agent which is linked to an antigen or enzyme, the antigen conjugates being useful for preparing antibodies, and the enzyme conjugates being useful as detectors in an immunoassay as well. Additionally carboxylic acids, esters and aldehydes which are derivatives of the blocking agents are provided which are useful in preparing the above conjugates.
    Type: Grant
    Filed: August 28, 1978
    Date of Patent: December 23, 1980
    Assignee: Syva Company
    Inventors: Prithipal Singh, Marcel R. Pirio
  • Patent number: 4238389
    Abstract: .alpha.-substituted derivatives of valproic acid are provided for conjugation to antigenic compositions, particularly poly(amino acids), and enzymes. The antigenic conjugates are employed for the production of antibodies, which find particular use in immunoassays for the determination of valproate, while the enzyme conjugate finds use in a homogeneous enzyme immunoassay for the determination of valproate. The compounds are synthesized by alkylating valproate at the tertiary carbon atom by an aliphatic chain with a terminal double bond which is cleaved to provide an acid or aldehyde group.
    Type: Grant
    Filed: February 12, 1979
    Date of Patent: December 9, 1980
    Assignee: Syva Company
    Inventors: Danton K. Leung, Prithipal Singh
  • Patent number: 4235969
    Abstract: Compounds are provided for use in the preparation of reagents which can be used in immunoassays for the determination of benzamides of N,N-dialkylethyleneamines. A linking group is provided, at a particular site of the drug, which provides a link between the above compounds and an antigen, with the resulting conjugate being employed for the preparation of antibodies. The antibodies find particular use in competitive protein binding assays. Conjugates to enzymes are prepared which find particular use in homogeneous enzyme immunoassays.
    Type: Grant
    Filed: May 8, 1978
    Date of Patent: November 25, 1980
    Assignee: Syva Company
    Inventors: Prithipal Singh, Marcel R. Pirio
  • Patent number: 4230805
    Abstract: Theophylline derivatives are provided for preparing reagents for use in competitive protein binding assays and for use as reagents in competitive protein binding assays. Theophylline is substituted at the 3 position and conjugated to antigens for production of antibodies which specifically recognize theophylline as distinct from structurally similar analogs such as caffeine. Enzyme conjugates are provided which find use for measuring the amount of theophylline in a sample suspected of containing theophylline. A method is provided employing the reagents for the determination of theophylline.
    Type: Grant
    Filed: January 11, 1979
    Date of Patent: October 28, 1980
    Assignee: Syva Company
    Inventors: Prithipal Singh, Mae W. Hu
  • Patent number: 4223013
    Abstract: Amitriptyline functionalized compounds are provided for conjugation to antigenic compositions, particularly poly(amino acids), and enzymes. The antigenic conjugates are employed for the production of antibodies, which find particular use in immunoassays for the determination of amitriptyline, while the enzyme conjugate finds use in a homogeneous enzyme immunoassay for the determination of amitriptyline.
    Type: Grant
    Filed: December 29, 1978
    Date of Patent: September 16, 1980
    Assignee: Syva Company
    Inventors: Mae W. Hu, Prithipal Singh
  • Patent number: 4156081
    Abstract: Theophylline derivatives are provided for preparing reagents for use in competitive protein binding assays and for use as reagents in competitive protein binding assays. Theophylline is substituted at the 3 position and conjugated to antigens for production of antibodies which specifically recognize theophylline as distinct from structurally similar analogs such as caffeine. Enzyme conjugates are provided which find use for measuring the amount of theophylline in a sample suspected of containing theophylline. A method is provided employing the reagents for the determination of theophylline.
    Type: Grant
    Filed: April 15, 1977
    Date of Patent: May 22, 1979
    Assignee: Syva Company
    Inventors: Prithipal Singh, Mae W. Hu
  • Patent number: 4069105
    Abstract: Derivatives of anesthetics involving anilides, lidocaine being illustrative, are provided, having an annular amino group. A difunctional linking group is provided, which provides a link to the annular amino group and an antigen, with the resulting conjugate being employed for the preparation of antibodies. The antibodies find particular use in competitive protein binding assays. Conjugates to enzymes are prepared which find particular use in homogeneous enzyme immunoassays.
    Type: Grant
    Filed: March 3, 1977
    Date of Patent: January 17, 1978
    Assignee: Syva Company
    Inventor: Prithipal Singh
  • Patent number: 4058511
    Abstract: Derivatives of dibenz[b,f]azepine drugs are provided for preparation of antigens and antibodies, the antibodies finding use in immunoassays for the dibenz[b,f]azepine drugs. Specifically, N-oxoaliphatic substituted carbamoyl dibenz[b,f]azepine compounds are provided which are conjugated with antigenic materials and injected into animals for production of antibodies specific for the azepine drug.
    Type: Grant
    Filed: January 12, 1976
    Date of Patent: November 15, 1977
    Assignee: Syva Company
    Inventor: Prithipal Singh