Patents Represented by Law Firm Depaoli & O'Brien
  • Electrooptic device having a liquid crystalline polymer composite optical component
    Patent number: 4933111
    Abstract: This invention provides an optical medium which consists of a composite of a homogeneous inorganic oxide glass monolith with a microporous structure containing a liquid crystalline polymer component.In one embodient this invention provides a sol-gel process for producing a composite of a transparent homogeneous microporous inorganic oxide glass monolith and a liquid crystalline polymer.
    Type: Grant
    Filed: September 19, 1988
    Date of Patent: June 12, 1990
    Assignee: Hoechst Celanese Corp.
    Inventors: Alan Buckley, Tessie M. Che, Thomas M. Leslie, James B. Stamatoff, Dagobert E. Stuetz, Donald R. Ulrich
  • Preparation of interstitial titanium ceramic fibers
    Patent number: 4931316
    Abstract: Titanium-containing preceramic fibers are provided with a high loading of titanium by impregnating a polymeric fiber with a liquid comprising a titanium alkoxide where the alkoxide contains at least 2 carbon atoms and precipitating the titanium alkoxide in the fiber as titanium dioxide. Useful titanium alkoxides include titanium tetraethoxide, titanium tetrabutoxide and titanium isopropoxide.
    Type: Grant
    Filed: September 6, 1988
    Date of Patent: June 5, 1990
    Assignee: Hoechst Celanese Corp.
    Inventor: Robert E. Johnson
  • Boron-containing preceramic blend and fiber formed therefrom
    Patent number: 4931100
    Abstract: A process for producing boron-containing ceramics such as boron carbide and boron nitride comprises pyrolyzing a blend of a precarbonaceous polymer such as polyacrylonitrile and a boron-containing polymer such as that formed by the reaction of a borane with a Lewis base. Pyrolyzation in an inert atmosphere yields boron carbide while pyrolyzation in a reactive gas burns away the precarbonaceous polymer and yields a ceramic comprising the reaction product of boron and the pyrolyzation gas. Boron nitride ceramics are formed by pyrolyzing the preceramic blend in ammonia.
    Type: Grant
    Filed: January 5, 1989
    Date of Patent: June 5, 1990
    Assignee: Hoechst Celanese Corp.
    Inventor: Robert E. Johnson
  • Bisacrylate monomers and polymers exhibiting nonlinear optical response
    Patent number: 4929696
    Abstract: This invention provides novel bisacrylate monomers and thermoset polymers which exhibit nonlinear optical response. The polymers have utility as a transparent nonlinear optical component in optical light switch and light modulator devices.
    Type: Grant
    Filed: November 13, 1989
    Date of Patent: May 29, 1990
    Assignee: Hoechst Celanese Corp.
    Inventors: Ronald N. DeMartino, Anthony J. East, Gordon W. Calundann
  • Low warped filled polyoxymethylene compositions
    Patent number: 4921885
    Abstract: A low warp, filled polyoxymethylene composition comprises a bimodal distribution of glass beads.
    Type: Grant
    Filed: July 12, 1988
    Date of Patent: May 1, 1990
    Assignee: Hoechst Celanese Corporation
    Inventors: Derrick B. McKie, Andris Olukalns
  • Bisacrylate monomers and polymers exhibiting nonlinear optical response
    Patent number: 4922003
    Abstract: This invention provides novel bisacrylate monomers and thermoset polymers which exhibit nonlinear optical response. The polymers have utility as a transparent nonlinear optical component in optical light switch and light modulator devices.
    Type: Grant
    Filed: December 21, 1987
    Date of Patent: May 1, 1990
    Assignee: Hoechst Celanese Corp.
    Inventors: Ronald N. DeMartino, Anthony J. East, Gordon W. Calundann
  • Side chain liquid crystalline acrylic copolymers exhibiting nonlinear optical response
    Patent number: 4915491
    Abstract: This invention provides novel acrylic copolymers which exhibit nonlinear optical response, and which have utility as a transparent optical component in optical light switch and light modulator devices.
    Type: Grant
    Filed: October 3, 1986
    Date of Patent: April 10, 1990
    Assignee: Hoechst Celanese Corporation
    Inventors: Ronald N. DeMartino, Hyun-Nam Yoon, James B. Stamatoff
  • Side chain liquid crystalline polymers exhibiting nonlinear optical response
    Patent number: 4913836
    Abstract: This invention provides novel side chain liquid crystalline polymers. An invention polymer exhibits nonlinear optical response, and has utility as a transparent nonlinear optical component in optical light switch and light modulator devices.
    Type: Grant
    Filed: December 5, 1988
    Date of Patent: April 3, 1990
    Assignee: Hoechst Celanese Corp.
    Inventor: Anthony J. East
  • Injection moldable polyimides
    Patent number: 4914175
    Abstract: In one embodiment this invention provides injection moldable polyimides, as exemplified by the condensation and imidization product of a aromatic dianhydride such as 2,2-bis(3,4-dicarboxyphenyl)propane dianhydride with a novel aromatic diamine such as 2,2-bis[p,p'-(m-aminophenoxy)phenylsulfonyl(p-phenyleneoxy)phenyl]propane.
    Type: Grant
    Filed: May 10, 1988
    Date of Patent: April 3, 1990
    Assignee: Hoechst Celanese Corp.
    Inventor: Eui W. Choe
  • Organic-inorganic composites with enhanced nonlinear optical response
    Patent number: 4913845
    Abstract: In one embodiment this invention provides an nonlinear optical medium which is a composite of a polymer matrix which exhibits nonlinear optic response, and a silver colloid which is dispersed in the polymer matrix.
    Type: Grant
    Filed: January 10, 1989
    Date of Patent: April 3, 1990
    Assignee: Hoechst Celanese Corp.
    Inventors: Gunilla E. Gillberg-LaForce, Garo Khanarian
  • Acrylic polymers and copolymers exhibiting nonlinear optical response
    Patent number: 4913844
    Abstract: This invention provides novel isotropic acrylic polymers and copolymers which exhibit nonlinear optical response, and which have utility as a transparent optical component in optical light switch and light modulator devices.
    Type: Grant
    Filed: January 25, 1988
    Date of Patent: April 3, 1990
    Assignee: Hoechst Celanese Corp.
    Inventor: Ronald N. DeMartino
  • Polymerizable quaternary ammonium methyl carbonates
    Patent number: 4910325
    Abstract: In one embodiment this invention provides a novel polymerizable quaternary ammonium carbonate corresponding to the formula: ##STR1## In another embodiment this invention provides a novel copolymer of the above represented methacrylamidopropyltrimethylammonium methyl carbonate and acrylamide, which exhibits a high level clay flocculation efficiency.
    Type: Grant
    Filed: January 25, 1989
    Date of Patent: March 20, 1990
    Assignee: Hoechst Celanese Corporation
    Inventors: Thomas C. Shen, James H. Rea
  • Reaction injection molding of ceramic or metallic greenbodies
    Patent number: 4906424
    Abstract: Greenbodies are produced by a RIM injection molding process wherein a homogeneous mixture of finely divided ceramic or metallic material and a polymerizable monomeric binder is injected into a mold and held at an elevated temperature for a sufficient time to polymerize the binder and form the greenbody. A preferred monomeric binder includes di- and tri-acrylate or -methacrylate esters of polyols. The low viscosity of the monomeric binder allows a loading of ceramic material of greater than 50 vol. % without adversely affecting the ability to injection mold the mixture.
    Type: Grant
    Filed: February 16, 1988
    Date of Patent: March 6, 1990
    Assignee: Hoechst Celanese Corp.
    Inventors: O. Richard Hughes, John R. Costanza
  • Azomethine compositions having nonlinear optical properties
    Patent number: 4906407
    Abstract: In one embodiment this invention provides a novel class of azomethine compounds which exhibit nonlinear optical response, such as 4-(4-dimethylaminobenzylideneamino)-4'-nitrostilbene: ##STR1##
    Type: Grant
    Filed: March 20, 1989
    Date of Patent: March 6, 1990
    Assignee: Hoechst Celanese Corporation
    Inventors: Ronald N. DeMartino, Hyun-Nam Yoon, James B. Stamatoff
  • Ceramic alloys from colloidal metal alloy suspensions
    Patent number: 4904424
    Abstract: Ceramic alloys or solid solutions are formed by dispersing a powdery metal alloy or intimate mixture of two alloying metals in a precarbonaceous polymer such as polyacrylonitrile, forming the mixture into a molded article such as fibers, and heating the molded articles at a temperature and in a pyrolyzation atmosphere sufficient to carbonize the polymer and cause reaction of the metals with carbon and/or the pyrolyzation gas.
    Type: Grant
    Filed: May 29, 1987
    Date of Patent: February 27, 1990
    Assignee: Hoechst Celanese Corporation
    Inventor: Robert E. Johnson
  • 4H-quinolizin-4-one compounds exhibiting therapeutic activities
    Patent number: 4904657
    Abstract: This invention provides novel 4H-quinolizin-4-one compounds which exhibit a selective inhibitory activity against IgE-antibody formation, and have utility for treatment of diseases associated with IgE formation in mammals, such as allergic bronchial asthma, allergic rhinitis, atopic dermatitis, hypersensitiveness, and the like.
    Type: Grant
    Filed: September 15, 1988
    Date of Patent: February 27, 1990
    Assignee: Kissei Pharmaceutical Co., Ltd.
    Inventors: Yoshikazu Kurashina, Hiroshi Miyata, Den-ichi Momose
  • Preparation of sodium diethyl oxalacetate
    Patent number: 4902819
    Abstract: Sodium diethyl oxalacetate is prepared in a specific manner by adding sodium ethoxide to a mixture of diethyl oxalate and ethyl acetate to obtain a free flowing sodium salt which is easily separable and purified.
    Type: Grant
    Filed: September 22, 1988
    Date of Patent: February 20, 1990
    Assignee: Hoechst Celanese Corporation
    Inventors: B. Franklin Gupton, James H. Rae
  • Polyester molding composition
    Patent number: 4900610
    Abstract: A thermoplastic molding composition comprising a polyester blend of polybutylene terephthalate and a copolyester derived from condensing ethylene glycol, cyclohexanedimethanol and terephthalic acid wherein the ethylene glycol units of the copolyester comprises at least 25 mole % based on the total glycol content. The polyester blend can also include an impact modifier. The blend is useful in the formation of molded keycaps.
    Type: Grant
    Filed: February 19, 1988
    Date of Patent: February 13, 1990
    Assignee: Hoechst Celanese Corporation
    Inventors: Arie A. Hochberg, Varkki P. Chacko, Paul DeStio
  • Inorganic-organic composite compositions exhibiting nonlinear optical response
    Patent number: 4898755
    Abstract: This invention provides an optical medium which consists of an inorganic glass monolith with a microporous structure containing an organic component which exhibits nonlinear optical response.In one embodiment this invention provides a sol-gel process for producing a composite of a transparent homogeneous microporous inorganic oxide glass monolith and an organic compound which exhibits nonlinear optical response.
    Type: Grant
    Filed: October 24, 1988
    Date of Patent: February 6, 1990
    Assignee: Hoechst Celanese Corporation
    Inventors: Tessie M. Che, Dagobert E. Stuetz, Alan Buckley, Donald R. Ulrich
  • Optical light switch or modulator device with a liquid crystalline composite optical component
    Patent number: 4898454
    Abstract: This invention provides an optical medium which consists of a composite of a homogeneous inorganic oxide glass monolith with a microporous structure containing a liquid crystalline component. In one embodiment this invention provides a sol-gel process for producing a composite of a transparent homogeneous microporous inorganic oxide glass monolith and a liquid crystalline compound.
    Type: Grant
    Filed: August 24, 1988
    Date of Patent: February 6, 1990
    Assignee: Hoechst Celanese Corporation
    Inventors: Alan Buckley, Tessie M. Che, Thomas M. Leslie, James B. Stamatoff, Dagobert E. Stuetz, Donald R. Ulrich