Quotables
"Fooling around with alternating current is just a waste of time. Nobody will use it, ever."
Thomas Edison ; 1889
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7339021 | Method for preparing polycarbonate resin The present invention relates to a method for preparing polycarbonate resin, and more particularly to a method for effectively preparing polycarbonate resin having a large molecular weight in a short time under a melt polymerization condition using a catalyst system... | 03/04/2008 |
| 7312257 | Polymer encapsulation of high aspect ratio materials and methods of making same Embodiments of this invention comprise a pigment comprising one or more substantially spherical-shaped beads, wherein each substantially spherical-shaped bead comprises one or more high aspect ratio particles encapsulated within an encapsulating material. Embodiment... | 12/25/2007 |
| 7309756 | Methods for converting linear polyesters to macrocyclic oligoester compositions and macrocyclic oligoesters Macrocyclic oligoesters and compositions comprising macrocyclic oligoesters are prepared from intermediate molecular weight polyesters. In one embodiment, a diol is contacted with a dicarboxylic acid or a dicarboxylate in the presence of a catalyst to produce a comp... | 12/18/2007 |
| 7279544 | Transesterification process for the production of polycarbonates having a low content of volatile compounds A multi stage process for the production of polycarbonates having low monomer content is disclosed. The process entails, in sequence, (i) transesterifying in the melt at least one dihydroxyaryl compound with at least one diaryl carbonate in the presence of at least ... | 10/09/2007 |
| 7175086 | Authentication system, data device, and methods for using the same An authentication system may comprise: a first light source, a second light source, and at least three optically filtered light sensing devices. The first light source can have a first light source spectral distribution and can be capable of providing sufficient exc... | 02/13/2007 |
| 7151143 | Blends containing macrocyclic polyester oligomer and high molecular weight polymer The invention provides blends of macrocyclic polyester oligomer (MPO) with high-molecular-weight polymer and polymerization catalyst as friable, one-component, ready-to-polymerize materials with long shelf life. The invention also provides methods for preparation an... | 12/19/2006 |
| 7138479 | Aliphatic diol polycarbonates and their preparation The disclosure provides high quality, low yellowness index copolycarbonates comprising structural units derived from at least one aliphatic diol, at least an aromatic dihydroxy compound and a diaryl carbonate. Also disclosed herein is a method of making such copolyc... | 11/21/2006 |
| 7122614 | Aromatic polycarbonate resins for optical disk substrates The present invention provides an aromatic polycarbonate resin product for producing optical disc substrates of high reliability at high molding yield. The aromatic polycarbonate resin for optical disc substrates is produced by adding 0.015 to 0.05 parts by m... | 10/17/2006 |
| 7093721 | Filter assembly with sealed, magnetically coupled cleaning head actuator A filter assembly for removing filtrate from industrial process streams. The assembly includes a housing in which a filter element is disposed. The filter element has a surface against which the filtrate is trapped. A cleaning head to which cleaning blades are attac... | 08/22/2006 |
| 7071291 | Isolation, formulation and shaping of macrocyclic oligoesters Processes for isolating, formulating, and shaping macrocyclic oligesters were developed which allow efficient production of macrocyclic oligoesters substantially free from solvent, which may include additives, fillers, and catalysts. ... | 07/04/2006 |
| 7022806 | Methods for converting linear polyesters to macrocyclic oligoester compositions and macrocyclic oligoesters Macrocyclic oligoesters and compositions comprising macrocyclic oligoesters are prepared from intermediate molecular weight polyesters. In one embodiment, a diol is contacted with a dicarboxylic acid or a dicarboxylate in the presence of a catalyst to produce a comp... | 04/04/2006 |
| 6994914 | Macrocyclic polyester oligomers and processes for polymerizing the same A water slurry process is used to prepare a prepreg and to manufacture articles from macrocyclic polyester oligomers. In one embodiment, a process for preparing a water suspension of macrocyclic polyester oligomers includes the steps of contacting a macrocyclic poly... | 02/07/2006 |
| 6962968 | Purification of macrocyclic oligoesters Acid impurities, such as carboxylic acid-terminated polymers, are removed from macrocyclic oligoesters with ion exchange resins, resulting in macrocyclic oligoesters that are substantially free of acid impurities. The ion exchange resins can be regenerated anew and ... | 11/08/2005 |
| 6960626 | Intimate physical mixtures containing macrocyclic polyester oligomer and filler The invention provides intimate physical mixtures of macrocyclic polyester oligomer (MPO) and filler, as well as methods for their preparation and use. Improved dispersion of filler in a polymer matrix is achieved upon polymerization, and larger amounts of filler wi... | 11/01/2005 |
| 6916866 | Laser-absorbing molding compositions with low carbon black contents The present invention relates to natural-colored and pigmented thermoplastic molding compositions and molded parts fabricated therefrom that are laser-absorbing at least in partial spectral regions of the wavelength range from 700 to 1200 nm and that can be welded b... | 07/12/2005 |
| 6906147 | Catalytic systems This invention relates to single-component and multi-component catalytic systems using aryl titanates. Aryl titanate compounds are useful as catalysts and co-catalysts in single-component and multi-component catalytic systems (e.g., for the polymerization of macrocy... | 06/14/2005 |
| 6890988 | Aromatic polyester The present invention provides an aromatic polyester which is obtained by condensation polymerization reaction of terephthalic acid, 2,6-naphthalenedicarboxylic acid and acylated product obtained by acylation of parahydroxybenzoic acid and hydroquinone with fatty ac... | 05/10/2005 |
| 6740728 | Methods for the preparation of polyesters, poly(ester amide)s and poly(ester imide)s and uses of the materials obtained therefrom The present invention relates to methods for the preparation of polyesters, poly(ester amide)s and poly(ester imide)s. The materials obtained by the methods of present invention are useful as fluid separation membranes and as high performance materials. ... | 05/25/2004 |
| 6710152 | Solid particles Solid particles containing 10 to 90 parts by weight of a dihydroxy compound and 10 to 90 parts by weight of a carbonic acid ester are disclosed. Also disclosed is a process for the production of these particles, an apparatus suitable for the process and a method for... | 03/23/2004 |
| 6635710 | Manufacturing method for polycarbonate A method for manufacturing polycarbonate by melt-polycondensing bisphenol and carbonic acid diester uses as catalyst an alkali metal compound and/or alkaline earth metal compound (a). The catalyst is added to the bisphenol prior to the melt polycondensati... | 10/21/2003 |
| 6627121 | Photochromic naphthopyran compounds A photochromic naphthopyran of formula (I) wherein R1 through R15, which may be the same or different, are independently selected from the group consisting of hydrogen, C1 -C4 alkyl, C1 -C4... | 09/30/2003 |
| 6590022 | Process for preparing protective-colloid-stabilized vinylaromatic-1,3-diene copolymers A method is provided for producing protective colloid-stabilized vinyl aromatic-1.3-diene-copolymers in the form of their aqueous polymer dispersions or in the form of a powder which can be re-dispersed in water, by emulsion-polymerizing a mixture contain... | 07/08/2003 |
| 6562433 | Method for the preparation of polycarbonate with reduced levels of fries The present invention provides a composition comprising polycarbonate wherein the polycarbonate has a very low Fries content (e.g., above 5 ppm and below 360 ppm). The present invention also provides a polycarbonate having a very low Fries content which i... | 05/13/2003 |
| 6323303 | Melt polycarbonate catalyst systems This invention provides a method for preparing polycarbonates, which utilizes polycondensation catalysts which are compounds or complexes of Ruthenium (II) and (III). Preferred catalysts are compounds of the formula [Ru(aryl)3 ]2 | 11/27/2001 |
| 6262219 | Method for producing polycarbonate The present invention relates to a transesterification method for producing solvent-free polycarbonate, using N-alkyl-substituted piperidines or N-alkyl-substituted morpholines comprising C2 -C12 N-alkyl substituents, preferably C | 07/17/2001 |
| 6117968 | Interfacial method for preparing copolyestercarbonates The level of anhydride linkages in copolyestercarbonates is decreased by preparing the copolyestercarbonate interfacially in a two-step method from at least one dihydroxyaromatic compound and at least one dicarboxylic acid. The first step is conducted at ... | 09/12/2000 |
| 6093784 | Electrophotographic photoconductor and polycarbonate resin for use therein An electrophotographic photoconductor is composed of an electroconductive support and a photoconductive layer formed thereon, which photoconductive layer includes a polycarbonate resin. Aromatic polycarbonate resins not only for the electrophotographic ph... | 07/25/2000 |
| 6037437 | Method for producing an aromatic polycarbonate A method for producing an aromatic polycarbonate which comprises subjecting to a transesterification polymerization reaction at least one polymerizable material selected from a molten monomer mixture of an aromatic dihydroxy compound and a diaryl carbonat... | 03/14/2000 |
| 6015631 | Luminescent compound for an electroluminescence display device An organic polymer compound is synthesized by introducing an electron donor and an electron acceptor into a main polymer chain through chemical bonds in the mixing system at a molecular level. An electroluminescence display device (ELD) which has low driv... | 01/18/2000 |
| 5973102 | Static resistant polycarbonate compositions A static resistant polycarbonate composition is provided comprising a polycarbonate, at least one mold release agent, and at least one antistatic agent. The disclosed composition optionally comprises a heat stabilizer. Static resistant compact disks are m... | 10/26/1999 |
| 5969084 | Process for producing polycarbonate resin with high flowability A process for producing a polycarbonate resin with high flowability having a viscosity average molecular weight (Mv) of 13,000 to 20,000 according to an interfacial polymerization method which comprises the steps of forming a reaction mixture while inject... | 10/19/1999 |
| 5942594 | Polycarbonate and process for producing the same A polycarbonate exhibiting excellent fluidity and moisture resistance and a process for efficiently producing the polycarbonate are provided. The polycarbonate has a main chain comprising a repeating unit represented by general formula (I): ##STR1## ... | 08/24/1999 |
| 5922826 | Process for producing polycarbonate There are disclosed a process for producing a polycarbonate through transesterification which comprises using, as a polymerization catalyst, (1) a combination of a nitrogen-containing organic basic compound and a quaternary phosphonium salt, (2) a tetraar... | 07/13/1999 |
| 5872882 | Non-linear optical polycarbonates The invention relates to non-linear optically active (NLO) polycarbonates and to NLO active waveguides containing these polycarbonates. Waveguides containing these NLO polycarbonates have a low loss of signal, a high glass transition temperature and good ... | 02/16/1999 |
| 5863992 | Tetraphenols and their use as polycarbonate branching agents Branched polycarbonates having properties suitable for blow molding are prepared by equilibrating a linear or branched aromatic polycarbonate with certain tetraphenols, especially 2,2,5,5-tetrakis (4-hydroxyphenyl)hexane and 1,1-bis(p-hydroxyphenyl)ethy... | 01/26/1999 |
| 5852156 | Polycarbonate composition A polycarbonate composition comprises (a) a substantially chlorine-atom free, aromatic dihydroxy compound/carbonic diester transesterification polycarbonate, and the following components (b), (c) and (d) in specifically, extremely limited amounts, wherein... | 12/22/1998 |
| 5821322 | Diaminoalkyl quaternary ammonium salts and method for their preparation and use Diaminoalkyl quaternary ammonium salts are prepared by the reaction of alkyl halides with tertiary diamines having C2-20 primary alkyl radicals attached to nitrogen and an alkyl radical between the two nitrogen atoms in which at least three car... | 10/13/1998 |
| 5807965 | Interfacial copolyestercarbonate method using catalyst comprising hexaalkylguanidinium salt and tertiary amine The level of anhydride linkages in copolyestercarbonates is decreased by preparing the copolyestercarbonate interfacially in a two-step method from at least one dihydroxyaromatic compound and at least one dicarboxylic acid. The first step is conducted at ... | 09/15/1998 |
| 5777064 | Production method of polycarbonate A method of producing a polycarbonate excellent in the hue, the thermal stability, and the electrolysis stability by supplying a polycarbonate obtained by a transesterification method to an extruder having vent(s), melting the polycarbonate, and adding an... | 07/07/1998 |
| 5767224 | Two-step process for the production of thermoplastic polycarbonate The invention relates to a two-step melt process for the production of thermoplastic, solvent-free, low-branching polycarbonates with low --OH terminal group content using a self-cleaning high-viscosity reactor.... | 06/16/1998 |
