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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 7385067 | Process for the preparation of compounds having a CFO bridge The invention relates to a process for the preparation of compounds containing at least one —CF2—O— bridge in the molecule, in which a) an acid is added onto at least one ketene dithioketal, b) the... | 06/10/2008 |
| 7265082 | Azeotrope-like compositions of 1,1,1,3,3-pentachloropropane and carbon tetrachloride The invention relates to azeotropic and azeotrope-like mixtures of 1,1,1,3,3-pentachloropropane (HCC-240fa) and carbon tetrachloride and a process for separating the azeotrope-like mixtures. The compositions of the invention are useful as an intermediate in the prod... | 09/04/2007 |
| 7230146 | Process for producing fluoropropenes Dehydrohalogenation processes for the preparation of fluoropropenes from corresponding halopropanes, in which the fluoropropenes have the formula CF3CY═CXNHP, wherein X and Y are independently hydrogen or a halogen selected from fl... | 06/12/2007 |
| 7067705 | Process for the preparation of 1,1-dichloro-3,3,3-trifluoropropane A convenient and economical process for the preparation of 1,1-dichloro-3,3,3-trifluoropropane (HCFC-243) by the reaction of 1,1,1,3,3-pentachloropropane (HCC-240) with hydrogen fluoride in the presence of an activated hydrofluorination catalyst. Also, the selective... | 06/27/2006 |
| 7014890 | Fluorinated naphthalenes, liquid-crystal mixtures comprising them, and liquid-crystal displays Compounds of the formula (I) in which the parameters are as defined herein, are suitable for use in liquid-crystal media and liquid-crystal displays which contain these media. ... | 03/21/2006 |
| 6759101 | Liquid crystalline materials containing perfluoroalkyl and alkenyl tail groups Compounds that are useful as components in liquid crystal compositions, particularly in ferroelectric liquid crystal compositions. Compounds of the invention are rod-like molecules with a mesogenic (generally linear) core to which an alkene tail and an alkyl or alko... | 07/06/2004 |
| 6682785 | Fluorinated anthracenes, and their use in liquid-crystal mixtures The invention relates to compounds of the formula (I) having a fluorinated anthracene or fluorinated tetrahydroanthracene core structure and to liquid-crystal mixtures comprising these compounds and to the use thereof in liquid-crystal displays.... | 01/27/2004 |
| 6632484 | Dialkyne compounds Described are dialkyne compounds of the formula I ##STR1## in which n, m, R1, R2, X1, X2, X3, X4, Z1, Z2, A1, A2, Q, Y1 and Y2 a... | 10/14/2003 |
| 6610219 | Functional materials for use in optical systems Functional optical materials for optical systems that are typically useful in optical waveguides, optical switching systems, optical modulators, optical computing systems and the like. Included are polymer systems and electrooptical chromophores. Polymers... | 08/26/2003 |
| 6491989 | Fluorinated naphthalene derivatives and their use in liquid crystal mixtures Fluorinated naphthalene derivatives of the formula (I) R1 (--A1 --M1)a (--A2 --M2)b --B--(--M3 --A3)c --(M4 --A4)d --R | 12/10/2002 |
| 6489523 | Process for producing hexafluoroethane and use thereof The present invention intends to provide a process for producing CF3 CF3 with good profitability using CF3 CHF2 containing a compound having chlorine atom within the molecule, and use thereof. In the process of the p... | 12/03/2002 |
| 6475595 | Fluorocyclohexene derivatives, and liquid-crystalline medium Fluorocyclohexene derivatives of formula I R1 --(A1 --Z1)n --A--(Z2 --A2)m --Z3 --B--(Z4 --A3)p --R2 I, in which n, m, p, R1 | 11/05/2002 |
| 6303194 | Acetylene derivatives, and liquid-crystalline medium The invention relates to acetylene derivatives of the formula I ##STR1## in which n, m, R1, R2, X1, X2, X3, X4, Z1, Z2, A1, A2, Q, Y1 and Y... | 10/16/2001 |
| 6117361 | Liquid crystal compound having fluorine-substituted 1,4-phenylene moiety, liquid crystal composition and liquid crystal display element A compound represented by the following general formula (1) is provided. This has broader temperature range of nematic phase, lower viscosity and higher miscibility with other liquid crystal compounds at low temperature than those of conventional liquid c... | 09/12/2000 |
| 6023004 | Liquid phase catalytic fluorination of hydrochlorocarbon and hydrochlorofluorocarbon A process for the catalytic fluorination of hydrochlorocarbons and hydrochlorofluorocarbons in the liquid phase. The process is useful for fluorinating hydrochloropropanes, hydrochlorofluoropropanes, hydrochloropropenes and hydrochlorofluoropropenes and m... | 02/08/2000 |
| 5972241 | Liquid crystal compounds having a chiral fluorinated terminal portion Fluorine-containing, chiral liquid crystal compounds comprise (a) a chiral fluorochemical terminal portion containing at least one methylene group and optionally containing at least one catenary ether oxygen atom; (b) a saturated, chiral or achiral, hydro... | 10/26/1999 |
| 5405550 | Compounds and methods based on [1.1.1]propellane Molecular bulding beams, liquid crystals, and surfactants in the form of compounds based on [1.1.1]propellane, including poly[1.1.1]propellanes. Molecular building beams having a telomeric or polymeric chain staff, and linking groups functionalized on one... | 04/11/1995 |
| 5336816 | Method for preparing 1,1-dichloro-1-fluoroethane A more efficient reaction mechanism is provided for producing 1,1-dichloro-1-fluoroethane (HCFC-141b) by reacting vinylidene chloride with hydrogen fluoride in the liquid phase in the presence of a catalyst and sulfone-based or nitrated solvent. In partic... | 08/09/1994 |
| 5159082 | Process for producing aromatic compound A process for producing an aromatic compound is disclosed, which comprises coupling an aromatic sulfinic acid or a salt thereof with an aromatic halogen compound having at least one halogen atom attached to the carbon atom of the aromatic nucleus thereof ... | 10/27/1992 |
| 4894109 | Method and apparatus for tacking together the copies of multicopy forms A method and apparatus for tacking together multipage forms having pin holes with the use of adhesive tacking tape.... | 01/16/1990 |
| 4871470 | Cyclohexane derivatives Cyclohexane derivatives of formula I ##STR1## wherein R is an alkyl group which has 1-12 C atoms and in which one or two non-adjacent CH2 groups can also be replaced by O, --CO--O-- or --OCO--, A1 and A2 each independ... | 10/03/1989 |
| 4853151 | Dispirotetradecanes Dispirotetradecanes of the formula I ##STR1## wherein R1 and R2 are each independently of each other alkyl containing 1 to 12 carbon atoms wherein one or more non-adjacent CH2 groups may also be replaced by --O--, --C... | 08/01/1989 |
| 4846998 | Cyclohexane derivatives Cyclohexane derivatives of the formula I in which R1 and R2 are each an alkyl group having 1-10 C atoms, in which one or two non-adjacent CH2 groups can also be replaced by O atoms and/or --CO-- groups and/or --CO--O-- groups a... | 07/11/1989 |
| 4724097 | Bicyclohexylethanes New bicyclohexylethanes of formula I wherein R1 is alkyl; R2 is alkyl, in which one or two non-adjacent CH2 groups can be replaced by 0 atoms, or is F, Cl, Br, CN, --COOalkyl or --O--CO--alkyl; or one of the radicals R1 and R2 ... | 02/09/1988 |
| 4723005 | Anisotropic compounds and liquid crystal mixtures New anisotropic compounds of the formula (1) are useful in liquid crystal mixtures for electrooptical displays; at least one of the end groups of the compounds (1) is an alkyl group which carries cyano or halogen in a terminal or non-terminal position. Th... | 02/02/1988 |
| 4707295 | Bicyclooctane derivatives Bicyclooctane derivatives of the formula I wherein R1 and R2 independently of one another are each an alkyl group which has 1-12 C atoms and in which it is also possible for one or two non-adjacent CH2 groups to be replaced by ... | 11/17/1987 |
| 4686289 | Anisotropic compounds and liquid crystal mixtures New anisotropic compounds with a cross-polarizing substituent have the formula (1) ##STR1## The increase in &3xb5;.perp. is achieved by the polarizing group X, preferably the cyano group or a halogen atom, which is not laterally on the ring, as ... | 08/11/1987 |
| 4627933 | Liquid crystalline phases containing alkylene-type bridges Compounds of the formula wherein R1 and R2 are each independently alkyl or alkoxy each of 1-12 C atoms, F, Cl, Br, CN or --Q3 --R3, or one of R1 and R2 can also be H; Q1, Q2 | 12/09/1986 |
| 4606845 | Bicyclohexylethanes New bicyclohexylethanes of formula I wherein R1 is alkyl; R2 is alkyl, in which one or two non-adjacent CH2 groups can be replaced by O atoms, or is F, Cl, Br, CN, --COOalkyl or --O--CO-alkyl; or one of the radicals R1 | 08/19/1986 |
| 4551264 | Polyhalogenoaromatic compounds for liquid crystal compositions New polyhalogenoaromatic compounds of Formula I ##STR1## wherein Y and Z are each independently alkyl, alkoxy or alkanoyl each of 1 to 12 C atoms, --COOR1, --O--CO--R1, CN, NO2, NH2 or OH; Q is one or two i... | 11/05/1985 |
| 4472293 | High temperature liquid crystal substances of four rings and liquid crystal compositions containing the same Liquid crystal compounds which exhibit a liquid crystal phase within a broad temperature range and have a high clearing point and nevertheless a low viscosity, and liquid crystal compositions containing the same are provided, which liquid crystal compound... | 09/18/1984 |
| 4434073 | Perhydrophenanthrene derivatives, their preparation, and their use in liquid-crystalline dielectrics and electro-optical display elements Perhydrophenanthrene derivatives of formula I ##STR1## wherein R1 is alkyl of 1-10 C atoms and R2 is alkyl, alkoxy or alkanoyloxy each of 1-10 C atoms, H, Br, Cl or CN, have an extremely low optical anisotropy and are particular... | 02/28/1984 |
| 4405488 | Liquid-crystalline halogenobenzene derivatives New liquid crystal compounds having a low viscosity and nevertheless having a high transparent point and a broad nematic temperature range, and liquid crystal compositions containing the same are provided. The compounds are liquid-crystalline halogenobenz... | 09/20/1983 |
