Patents by Inventor Andrew P. Chafin

Andrew P. Chafin 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: 5587488
    Abstract: Novel bis-sulfonium salts of amino substituted bis(halomethyl)benzene are disclosed. The sulfonium salts are prepared by reaction of an amino substituted bis(halo methyl)benzene with an aliphatic sulfide. These sulfonium salts can be made into polymer having non-linear optical properties, and polymers which can be converted to electrically conductive polymers. Such polymers are produced by reacting a novel bis-cycloalkylene sulfonium salt of 2,5,N,N-tetramethylaniline hydrochloride, such as 2,5-(N,N-dimethyl)aniline hydrochloride dimethylene bis-(tetramethylene sulfonium chloride) with alkali metal hydroxide to form a cycloalkylene sulfonium salt precursor polymer, and then heating the precursor polymer under conditions to produce the amino substituted phenylene vinylene polymer, such as poly(2-(N,N-dimethylamino) phenylene vinylene).
    Type: Grant
    Filed: May 10, 1995
    Date of Patent: December 24, 1996
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: John D. Stenger-Smith, William P. Norris, Andrew P. Chafin
  • Patent number: 5585522
    Abstract: Novel amino substituted bishalomethyl benzene compounds, which are precurs to phenylene polymers are disclosed having non-linear optical properties, and which can be converted to electrically conductive polymers. Such polymers are produced by reacting a novel amino substituted bishalomethyl benzene compound with a dialkyl sulfide to make a bis-cycloalkylene sulfonium salt of 2,5,N,N-tetramethylaniline hydrochloride, which is 2,5-(N,N-dimethyl)aniline hydrochloride dimethylene bis-(tetramethylene sulfonium chloride) and reacting this sulfonium salt with alkali metal hydroxide to form a cycloalkylene sulfonium salt precursor polymer, and then heating the precursor polymer under conditions to produce the amino substituted phenylene vinylene polymer, such as poly(2-(N,N-dimethylamino) phenylene vinylene). The polymers can also be made directly by treatment of the bis chlormethyl dimethyl aminobenzene hydrochloride derivative with alkali metal alkoxide.
    Type: Grant
    Filed: May 10, 1995
    Date of Patent: December 17, 1996
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: John D. Stenger-Smith, William P. Norris, Andrew P. Chafin
  • Patent number: 5578699
    Abstract: A process for synthesizing novel conjugated amino substituted phenylene pmers is disclosed. The process results in polymers having non-linear optical properties, and the polymers can be converted to electrically conductive polymers. The process involves reacting a novel bis-cycloalkylene sulfonium salt of 2,5,N,N-tetramethylaniline hydrochloride, such as 2,5-(N,N-dimethyl)aniline hydrochloride dimethylene bis-(tetramethylene sulfonium chloride) with alkali metal hydroxide to form a cycloalkylene sulfonium salt precursor polymer, and then heating the precursor polymer under conditions to produce the amino substituted phenylene vinylene polymer, such as poly(2-(N,N-dimethylamino) phenylene vinylene). Another process involves treatment of the bis chlormethyl dimethyl aniline hydrochloride derivative with alkali metal alkoxide.
    Type: Grant
    Filed: May 18, 1995
    Date of Patent: November 26, 1996
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: John D. Stenger-Smith, William P. Norris, Andrew P. Chafin, Scott T. Sackinger
  • Patent number: 5520968
    Abstract: Second-order nonlinear optical polymeric films, including alternating monlecular layers of two head-to-head, mainchain, amphophilic, chromophoric polymers, one polymer having the electron donating end of the chromophore attached to hydrophilic groups, and the other polymer having the electron donating end of the chromophore attached to hydrophobic groups, and methods of fabricating the films for use in optonics.
    Type: Grant
    Filed: May 5, 1995
    Date of Patent: May 28, 1996
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Kenneth J. Wynne, Geoffrey A. Lindsay, James M. Hoover, John Stenger-Smith, Ronald A. Henry, deceased, Andrew P. Chafin
  • Patent number: 5212269
    Abstract: Processible chromophoric polymers having nonlinear optical properties and wherein the chromophore is present in and is a part of the polymer backbone, including substantially all of the monomer or repeat units, with the dipole moments pointing in the same direction (head-to-tail) along the polymer backbone. Such polymers include phenylene, phenylene vinylene, stilbenylene, phenyl piperdine, and coumarin polymers.
    Type: Grant
    Filed: March 25, 1991
    Date of Patent: May 18, 1993
    Inventors: John Fischer, Ronald Henry, James Hoover, Geoffrey Lindsay, John Stenger-Smith, Andrew P. Chafin
  • Patent number: 5149818
    Abstract: Aminonitrobenzodifuroxan (CL-18) is prepared by directly converting pentanitroaniline to aminonitrobenzodifuroxan with heat in the presence of an excess of sodium azide. The pentanitroaniline is prepared in high yield from 3,5-dinitroaniline with a mixture of nitric acid and sulfuric acid in which the final sulfuric acid concentration is from 99.0 to 99.5%.
    Type: Grant
    Filed: October 1, 1990
    Date of Patent: September 22, 1992
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Stephen L. Christian, Andrew P. Chafin, Arnold T. Nielsen, Ronald L. Atkins, William P. Norris, Richard A. Hollins
  • Patent number: 4754040
    Abstract: A method of preparing 4,6-dinitro-5,7-diaminobenzofuroxan from 4,6-dichloenzofuroxan.
    Type: Grant
    Filed: February 25, 1985
    Date of Patent: June 28, 1988
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Andrew P. Chafin, Ronald L. Atkins
  • Patent number: 4600536
    Abstract: A new polynitro compound pentanitrophenyl azide is disclosed, and a method of preparation is disclosed wherein hexanitrobenzene is reacted with sodium azide. This new polynitro compound is useful as an explosive.
    Type: Grant
    Filed: October 19, 1984
    Date of Patent: July 15, 1986
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Andrew P. Chafin, Arnold T. Nielsen