Patents by Inventor John D. Pera

John D. Pera 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).

  • 1-methyl-3,5,7-triaza-1-azoniatricyclodecane compounds, a method for preparing these compounds, their use in the control of microorganisms in aqueous systems, and their use in the inhibition of corrosion
    Patent number: 5424007
    Abstract: Compounds of the formula ##STR1## wherein X is an anion selected from the group consisting of phosphate, borate and molybdate groups, and a method for making these compounds. The compounds are useful in the control of microorganisms in aqueous systems and in the inhibition of corrosion of metal surfaces in contact with aqueous systems.
    Type: Grant
    Filed: September 20, 1994
    Date of Patent: June 13, 1995
    Assignee: Buckman Laboratories International, Inc.
    Inventors: John D. Pera, S. Rao Rayudu
  • 1-methyl-3,5,7-triaza-1-azoniatricyclodecane compounds, a method for preparing these compounds, their use in the control of microorganisms in aqueous systems, and their use in the inhibition of corrosion
    Patent number: 5356548
    Abstract: Compounds of the formula ##STR1## wherein X is an anion selected from the group consisting of phosphate, borate and molybdate groups, and a method for making these compounds. The compounds are useful in the control of microorganisms in aqueous systems and in the inhibition of corrosion of metal surfaces in contact with aqueous systems.
    Type: Grant
    Filed: April 28, 1993
    Date of Patent: October 18, 1994
    Assignee: Buckman Laboratories International, Inc.
    Inventors: John D. Pera, S. Rao Rayudu
  • 1-methyl-3,5,7-triaza-1-azoniatricyclodecane compounds, a method for preparing these compounds, their use in the control of microorganisms in aqueous systems, and their use in the inhibition of corrosion
    Patent number: 5245031
    Abstract: Compounds of the formula ##STR1## wherein X is an anion selected from the group consisting of phosphate, borate and molybdate groups, and a method for making these compounds. The compounds are useful in the control of microorganisms in aqueous systems and in the inhibition of corrosion of metal surfaces in contact with aqueous systems.
    Type: Grant
    Filed: July 19, 1991
    Date of Patent: September 14, 1993
    Assignee: Buckman Laboratories International, Inc.
    Inventors: John D. Pera, S. Rao Rayudu
  • Process for the production of 2-thiocyanomethylthiobenzothiazole
    Patent number: 5073638
    Abstract: A process for the manufacture of 2-thiocyanomethylthiobenzothiazole. 2-Chloromethylthiobenzothiazole is reacted, in the presence of at least one glycol ether as a solvent for the reaction, with either an alkali metal or an ammonium thiocyanate at a temperature and for a time sufficient to produce the 2-thiocyanomethylthiobenzothiazole.
    Type: Grant
    Filed: September 26, 1990
    Date of Patent: December 17, 1991
    Assignee: Buckman Laboratores International, Inc.
    Inventors: Lawrence S. Conaway, Marc F. Nagel, John D. Pera
  • Fungicidal and corrosion inhibiting paint pigments
    Patent number: 5066334
    Abstract: The present invention relates to a silica-coated calcium pyroborate pigment in particulate form and to its use as a corrosion inhibitor and film preservative in paints.
    Type: Grant
    Filed: December 19, 1989
    Date of Patent: November 19, 1991
    Assignee: Buckman Laboratories International, Inc.
    Inventors: John D. Pera, Loel L. Hickman, Lawrence S. Conoway
  • 1-methyl-3,5,7-triaza-1-azoniatricyclodecane compounds
    Patent number: 5061797
    Abstract: Compounds of the formula ##STR1## wherein X is an anion selected from the group consisting of phosphate, borate and molybdate groups, and a method for making these compounds. The compounds are useful in the control of microorganisms in aqueous systems and in the inhibition of corrosion of metal surfaces in contact with aqueous systems.
    Type: Grant
    Filed: March 29, 1988
    Date of Patent: October 29, 1991
    Assignee: Buckman Laboratories International, Inc.
    Inventors: John D. Pera, S. Rao Rayudu
  • Microbicidal compositions of dimethylamine-epichlorohydrin amines
    Patent number: 5051124
    Abstract: A method of inhibiting the growth and proliferation of microorganisms by the use of a polymeric quaternary ammonium composition is provided. The composition is prepared by reacting dimethylamine and a polyfunctional amine with epichlorohydrin.
    Type: Grant
    Filed: October 24, 1989
    Date of Patent: September 24, 1991
    Assignee: Buckman Laboratories International, Inc.
    Inventor: John D. Pera
  • Ionene polymeric compositions, their preparation and use
    Patent number: 4970211
    Abstract: Novel capped polymeric quaternary ammonium compositions formed by reacting ionene type polymers with tertiary amines are useful as microbicides, corrosion inhibitors, debonding agents, flocculants, softeners, plant growth regulators, and demulsifiers.
    Type: Grant
    Filed: May 23, 1989
    Date of Patent: November 13, 1990
    Assignee: Buckman Laboratories International, Inc.
    Inventors: Joseph G. Fenyes, John D. Pera
  • 1-methyl-3,5,7-triaza-1-azoniatricyclodecane compounds, a method for preparing these compounds, and their use in the control of microorganisms in aqueous systems
    Patent number: 4920107
    Abstract: A method of preserving an aqueous system which is susceptible to microbiological degradation, comprising the step of adding to the system a compound having the formula ##STR1## wherein X is an anion selected from the group consisting of sulfate, acetate and citrate groups, and wherein the compound is added in an amount sufficient to inhibit the growth and proleferation of at least one microogranism in the aqueous system.The compounds 1-methyl-3,5,7-triaza-1-azoniatricyclodecane acetate and 1-methyl-3,5,7-triaza-1-azoniatricyclodecane citrate, and a method for preparing these compounds comprising the reaction of ammonium citrate, or ammonium acetate, with methylamine, formaldehyde and ammonia in an aqueous medium.
    Type: Grant
    Filed: March 29, 1988
    Date of Patent: April 24, 1990
    Assignee: Buckman Laboratories International, Inc.
    Inventors: John D. Pera, S. Rao Rayudu
  • Ionene polymeric compositions, their preparation and use
    Patent number: 4851532
    Abstract: Novel capped polymeric quaternary ammonium compositions formed by reacting ionene type polymers with tertiary amines are useful as microbicides, corrosion inhibitors, debonding agents, flocculants, softeners, plant growth regulators, and demulsifiers.
    Type: Grant
    Filed: November 13, 1986
    Date of Patent: July 25, 1989
    Assignee: Buckman Laboratories, Inc.
    Inventors: Joseph G. Fenyes, John D. Pera
  • Polymeric quaternary ammonium compounds, their preparation and use
    Patent number: 4778813
    Abstract: Novel capped polymeric quaternary ammonium compositions formed by reacting ionene type polymers with tertiary amines are useful as microbicides, corrosion inhibitors, debonding agents, flocculants, softeners, and demulsifiers.
    Type: Grant
    Filed: January 30, 1985
    Date of Patent: October 18, 1988
    Assignee: Buckman Laboratories International, Inc.
    Inventors: Joseph G. Fenyes, John D. Pera
  • Polymeric quaternary ammonium compounds and their uses
    Patent number: 4581058
    Abstract: Novel polyquaternary ammonium compounds prepared from N,N'-bis(dialkylaminoalkyl)ureas, hydrochloric acid, epichlorohydrin and tertiary amines are useful as microbicides, corrosion inhibitors, debonding agents, flocculants, softeners, anti-static agents, and demulsifiers.
    Type: Grant
    Filed: November 28, 1984
    Date of Patent: April 8, 1986
    Assignee: Buckman Laboratories, Inc.
    Inventors: Joseph G. Fenyes, John D. Pera
  • Method of preservation of aqueous systems by addition to said systems of quaternary ammonium salts of hexamethylenetetramine
    Patent number: 4505831
    Abstract: Quaternary ammonium salts formed by the reaction of hexamethylenetetramine with carboxylic acids and esters, amides and nitriles substituted in the alpha position by chlorine or bromine are preservatives for aqueous solutions, emulsions, and suspensions which are susceptible to microbiological degradation.
    Type: Grant
    Filed: June 20, 1983
    Date of Patent: March 19, 1985
    Assignee: Buckman Laboratories, Inc.
    Inventors: Joseph G. Fenyes, John D. Pera
  • Polymeric quaternary ammonium compounds and their uses
    Patent number: 4506081
    Abstract: Novel polyquaternary ammonium compounds prepared from N,N'-bis(dialkylaminoalkyl)ureas, hydrochloric acid, epichlorohydrin and tertiary amines are useful as microbicides, corrosion inhibitors, debonding agents, flocculants, softeners, anti-static agents, and demulsifiers.
    Type: Grant
    Filed: September 2, 1982
    Date of Patent: March 19, 1985
    Assignee: Buckman Laboratories, Inc.
    Inventors: Joseph G. Fenyes, John D. Pera
  • Aminoalkylenephosphonic acids and salts thereof and their use in aqueous systems
    Patent number: 4374040
    Abstract: Aminoalkylenephosphonic acids and their alkali metal salts prepared by a reaction utilizing a primary or secondary tetrahydrothiophenamine 1,1-dioxide or the hydrochloride thereof, an aldehyde or a ketone, and orthophosphorous acid are useful in the control of scale and sludge deposition in aqueous systems. When used in combination with known corrosion inhibitors they show synergistic results in inhibiting corrosion of metal surfaces in contact with an aqueous system that is normally corrosive to such metals.
    Type: Grant
    Filed: August 19, 1980
    Date of Patent: February 15, 1983
    Assignee: Buckman Laboratories, Inc.
    Inventors: Joseph G. E. Fenyes, John D. Pera
  • Slime control compositions and methods of using the same
    Patent number: 4293559
    Abstract: The present invention relates to certain compositions and processes useful for inhibiting the growth of microorganisms in water and, in particular, water used for industrial purposes; for example, in the manufacture of paper, in cooling water systems in effluent water treatment, and in secondary recovery petroleum operations. The novel processes and compositions of the present invention are processes or mixtures which show unexpected synergistic activity against microorganisms, including bacteria, sulfate-reducing bacteria, fungi, and algae, which produce slime in aqueous systems where such slime is objectionable from either an operational or aesthetic point of view. Specifically, the invention is directed to the use of compositions comprising 2-(thio-cyanomethylthio)benzothiazole and 2'-hydroxyethyl 2,3-dibromopropionate or 2'-hydroxyethyl 2-bromoacrylate.
    Type: Grant
    Filed: March 29, 1978
    Date of Patent: October 6, 1981
    Assignee: Buckman Laboratories, Inc.
    Inventors: John D. Buckman, Stanley J. Buckman, Betty S. Johnson, John D. Pera
  • Slime control compositions and methods of using the same
    Patent number: 4285765
    Abstract: The present invention relates to certain compositions and processes useful for inhibiting the growth of microorganisms in water and, in particular, water used for industrial purposes; for example, in the manufacture of paper, in cooling water systems, in effluent water treatment, and in secondary recovery petroleum operations. The novel processes and compositions of the present invention are processes or mixtures which show unexpected synergistic activity against microorganisms, including bacteria, sulfate-reducing bacteria, fungi, and algae, which produce slime in aqueous systems where such slime is objectionable from either an operational or aesthetic point of view. Specifically, the invention is directed to the use of compositions comprising 2-(thiocyanomethylthio)benzothiazole and 2,2-dibromo-3-nitrilopropionamide.
    Type: Grant
    Filed: September 24, 1980
    Date of Patent: August 25, 1981
    Assignee: Buckman Laboratories, Inc.
    Inventors: John D. Pera, Betty S. Johnson
  • Water-soluble mixtures of quaternary ammonium polymers, nonionic and/or cationic vinyl-addition polymers, and nonionic and/or cationic surfactants
    Patent number: 4250269
    Abstract: Water-soluble polymeric mixtures prepared by mixing 1 to 10 parts by weight of a quaternary ammonium polymer with 0.5 to 7 parts by weight of a high molecular weight nonionic and/or cationic vinyl-addition polymer, and 0.1 to 5 parts by weight of a nonionic and/or cationic surfactant have utility in many diverse applications.
    Type: Grant
    Filed: November 26, 1979
    Date of Patent: February 10, 1981
    Assignee: Buckman Laboratories, Inc.
    Inventors: Robert H. Buckman, Philip M. Hoekstra, John D. Pera
  • Aminoalkylenephosphonic acids and salts thereof and their use in aqueous systems
    Patent number: 4243524
    Abstract: Aminoalkylenephosphonic acids and their alkali metal salts prepared by a reaction utilizing a primary or secondary tetrahydrothiophenamine 1,1-dioxide or the hydrochloride thereof, an aldehyde or a ketone, and orthophosphorous acid are useful in the control of scale and sludge deposition in aqueous systems. When used in combination with known corrosion inhibitors they show synergistic results in inhibiting corrosion of metal surfaces in contact with an aqueous system that is normally corrosive to such metals.
    Type: Grant
    Filed: August 2, 1979
    Date of Patent: January 6, 1981
    Assignee: Buckman Laboratories, Inc.
    Inventors: Joseph G. E. Fenyes, John D. Pera
  • Aminoalkylenephosphonic acids and salts thereof and their use in aqueous systems
    Patent number: 4181806
    Abstract: Aminoalkylenephosphonic acids and their alkali metal salts prepared by a reaction utilizing a primary or secondary tetrahydrothiophenamine 1,1-dioxide or the hydrochloride thereof, an aldehyde or a ketone, and orthophosphorous acid are useful in the control of scale and sludge deposition in aqueous systems. When used in combination with known corrosion inhibitors they show synergistic results in inhibiting corrosion of metal surfaces in contact with an aqueous system that is normally corrosive to such metals.
    Type: Grant
    Filed: June 9, 1978
    Date of Patent: January 1, 1980
    Assignee: Buckman Laboratories, Inc.
    Inventors: Joseph G. E. Fenyes, John D. Pera