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Cloaking System Using Optoelectronically Controlled Camouflage
A Cloaking System designed to operate in the visible light spectrum, utilizes optoelectronics and/or photonic components to conceal an object within it.
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| Number | Title | Issue Date |
| 6831192 | Process for preparing methylenedianiline and methylenebis(phenyl isocyanate) A process for preparing methylenedianiline by reacting aniline with formaldehyde in the presence of acid catalysts comprising, in a semicontinuous process, introducing aniline with or without acid catalyst, feeding formaldehyde with or without acid catalyst through ... | 12/14/2004 |
| 6818795 | Process for the preparation of mixtures of methylenedianiline and its higher homologous products Process for the production of methylenedianiline and its higher homologous products which comprises reacting aniline, or one of its derivatives, and formaldehyde, or one of its precursors, in one or two reactors in the presence of a solid acid catalyst selected from... | 11/16/2004 |
| 6680385 | Catalytic preparation of aryl methyl ketones using a molecular oxygen-containing gas as the oxidant A method for the preparation of aryl methyl ketones converts a variety of ethyl arenas to the corresponding aryl methyl ketones using a dioxygen-containing gas as the oxidant. The catalyst used for the reaction is a metal complex bearing general formulas ... | 01/20/2004 |
| 6673970 | Process for preparing methylene diphenylamines by partial neutralization of acidic methylene diphenylamines Disclosed herein is a process for preparing a reaction product containing methylene diphenylamine, comprising reacting aniline and formaldehyde in the presence of an acid catalyst wherein the acid level of the resulting reaction mixture is reduced during ... | 01/06/2004 |
| 6639102 | Process for producing polyisocyanates of the diphenyl methane series having a reduced color value Polyisocyanates of the diphenyl methane series having reduced color values are obtained by a) reacting aniline and formaldehyde in the presence of an acid catalyst to form a polyamine, b) neutralizing the reaction mixture containing polyamine with a base,... | 10/28/2003 |
| 6610888 | Reaction of a solution comprising a mixture A method of reacting a solution comprising a mixture of chemical compounds which are in chemical equilibrium with one another with at least one further chemical compound (9) is provided. The method comprises the following steps: fractionation of the solut... | 08/26/2003 |
| 6433219 | Method for the production of methylenedi(phenylamine and methylenedi(phenyl isocyanate) A process for preparing methylenedianiline by reacting aniline with formaldehyde in the presence of acid catalysts comprising, in a semicontinuous process, introducing aniline with or without acid catalyst, feeding formaldehyde with or without acid cataly... | 08/13/2002 |
| 5942151 | Polymeric MDI color A process for the production of polymethylene polyphenyl polyisocyanates is disclosed. The process comprises phosgenating the corresponding polyamines in solution in an inert organic solvent, removing excess phosgene, and stripping the solvent, the improv... | 08/24/1999 |
| 5889070 | Process for preparing polyamines and polysocyanates Disclosed herein is an improved process for preparing a polyamine mixture derived by reacting aniline with formaldehyde in the presence of an acid catalyst the improvement comprising mildly reducing the polyamine mixture by a process step comprising catal... | 03/30/1999 |
| 5684180 | Fractionation and purification of aromatic polyamine mixtures and the use thereof The invention relates to a process for the fractionation and purification of aromatic polyamine mixtures and to the use thereof.... | 11/04/1997 |
| 5679841 | Fractionation and purification of aromatic polyamine mixtures and the use thereof The invention relates to a process for the fractionation and purification of aromatic polyamine mixtures and the use thereof.... | 10/21/1997 |
| 5679840 | Fractionation and purification of aromatic polyamine mixtures and the use thereof The invention relates to a process for the fractionation and purification of aromatic polyamine mixtures and their use.... | 10/21/1997 |
| 5675035 | Fractionation and purification of aromatic polyamine mixtures and the use thereof The invention relates to a process for the fractionation and purification of aromatic polyamine mixtures and to their use.... | 10/07/1997 |
| 5672737 | Fractionation and purification of mixtures of aromatic polyamines and use thereof The invention relates to a process for the fractionation and purification of mixtures of aromatic polyamines and to the use thereof.... | 09/30/1997 |
| 5648519 | Fractionation and purification of aromatic polyamine mixtures and the use thereof The invention relates to a process for the fractionation and purification of aromatic polyamine mixtures and to the use thereof.... | 07/15/1997 |
| 5648520 | Fractionation and purification of aromatic polyamine and the use thereof The invention relates to a process for the fractionation and purification of aromatic polyamine mixtures and the use thereof.... | 07/15/1997 |
| 5386059 | Process for preparing polyamines for lighter color polyisocyanate based foam The present invention encompasses an improved process for preparing polymethylene polyphenyl polyisocyanate comprising reacting phosgene with polymethylene polyphenyl polyamine, the improvement wherein the polymethylene polyphenyl polyamine is acidified p... | 01/31/1995 |
| 5359141 | Process for the production of polynuclear aromatic polyamines The invention relates to an improved process for the production of polynuclear aromatic polyamines by condensation of aniline with formaldehyde in the presence of water and acidic catalysts and working up of the reaction mixture by extraction with a hydro... | 10/25/1994 |
| 5312989 | Method for the purification of 4,4'-diamino-diphenylmethane A method of purifying 4,4'-diaminodiphenylmethane comprising partially melting a crystal of crude 4,4'-diaminodiphenylmethane and removing a melt to obtain a high purity 4,4'-diaminodiphenylmethane. By utilizing the method, a high purity 4,4'-diaminodiphe... | 05/17/1994 |
| 5296612 | Process for producing enyne derivatives A process for producing an enyne derivative, and intermediate, which is useful for preparing compounds showing strong inhibiting activities against squalane epoxidase of Eumycetes and strong anti-cholesterol activities. The process comprises reacting a co... | 03/22/1994 |
| 5286760 | Process for reducing impurity levels in methylene diphenyamines Disclosed herein is a process for preparing a reaction product containing methylene diphenylamine comprising reacting aniline with an aldehyde, in the presence of a low level of an acid wherein the acid level is reduced before digesting reaction mixture a... | 02/15/1994 |
| 5208379 | Hydrolysis of polyurethanes Waste or scrap polyurethane may be conveniently and economically converted to useful active-hydrogen containing polyethers and polyamines by contacting the polyurethane with water, strong base, and an activating agent such as a quaternary ammonium compoun... | 05/04/1993 |
| 5196591 | Process for the production of polynuclear aromatic polyamines The invention relates to an improved process for the production of polynuclear aromatic polyamines by condensation of aniline with formaldehyde in the presence of water and acidic catalysts and working up of the reaction mixture by extraction with a hydro... | 03/23/1993 |
| 5072045 | Process for the catalytic alkenylation of arylamines with conjugated dienes The invention relates to an improved process for producing alkenylated aromatic amines which involves the catalytic reaction of an aromatic amine with a diene. The improvement resides in using a solvent in which the aromatic amine and diene are soluble in... | 12/10/1991 |
| 5047591 | Single-stage process for producing bis-(amino-nitrophenyl)-methane Bis-(amino-nitrophenyl)-methane can be produced in one stage with an approximately quantitative yield by condensing o-nitraniline and formaldehyde in water at a temperature of between 20° and 40° C. in the presence of sulfuric acid, and subsequently ... | 09/10/1991 |
| 4924028 | Process for the production of polynuclear aromatic polyamines This invention relates to an improved process for the preparation of polynuclear aromatic polyamines in which the reaction product is prepared by condensing aniline with formaldehyde in the presence of water and acidic catalysts and is worked up by extrac... | 05/08/1990 |
| 4914236 | Process for the preparation of multinuclear aromatic polyamines The present invention relates to an improved process for the preparation of multinuclear aromatic polyamines by the condensation of aniline with formaldehyde in the presence of water and acid catalysts and working up of the reaction mixture by extraction ... | 04/03/1990 |
| 4798909 | Process for recovery of polyarylpolyamines An arylamine such as aniline is condensed with formaldehyde in the presence of aqueous hydrochloric acid to form a mass containing the hydrogen chloride salt of a polyarylpolyamine. The mass is contacted with additional aniline thereby forming an organic ... | 01/17/1989 |
| 4654443 | Hydrolysis of isocyanate distillation bottoms Liquid distillation residue formed in the phosgenation of polyamines to form polyisocyanates are hydrolyzed to reform the polyamine. The process comprises forming an adduct of the distillation residue with additional polyamine and then hydrolyzing the res... | 03/31/1987 |
| 4507475 | Process for purification of crude polyether polyols A process for purifying crude polyether polyols which are prepared by anionic polymerization of alkylene oxides in the presence of basic catalysts. The polyols are mixed with water and ortho-phosphoric acid in certain quantity ratios, an adsorption agent ... | 03/26/1985 |
| 4297511 | Method for the manufacture of polyarylamines having methylene bridges Through condensation ortho- and para-isomers of methylene dianiline (MDA) as well as PMPPA are produced as condensation products from arylamines, especially from aniline, and formaldehyde in the presence of acid catalysts, in which at least one component ... | 10/27/1981 |
| 4294987 | Process for preparing methylene dianilines An improvement is described in the process of preparing polymethylene polyphenyl polyamines by condensing aniline and formaldehyde in the presence of an acid catalyst in the initial condensation. The improvement enables the amount of acid which has to be ... | 10/13/1981 |
| 4281197 | Hydrolytic decomposition method Porous polyurethane solids such as open cell polyurethane foams are rapidly heated and hydrolytically decomposed into separate polyol component and diamine component by contacting the porous solids with saturated steam in a heated vacuum chamber. Separati... | 07/28/1981 |
| 4250114 | Process for the recovery of polyarylpolyamines An arylamine such as aniline is condensed with formaldehyde in the presence of aqueous hydrochloric acid to form a mass containing the hydrogen chloride salt of a polyarylpolyamine. The mass is contacted with additional aniline thereby forming an organic ... | 02/10/1981 |
| 4201722 | Process for separating 4,4'-diaminodiphenylmethane A process is described for the isolation of 4,4'-diaminodiphenylmethane in substantially pure form (of the order of 99% purity) from admixtures thereof with the corresponding 2,4'-isomer and 2,2'-isomer. The dihydrochloride of the isomeric mixture of diam... | 05/06/1980 |
| 4172847 | Treatment of methylene-bridged polyphenylpolyamime mixtures A process for treating methylene-bridged polyphenylpolyamine mixtures prepared by the silica-alumina catalyzed condensation reaction of aniline and formaldehyde to obtain substantially pure low functionality Diaminodiphenylmethanes having increased 4,4'-p... | 10/30/1979 |
| 4130588 | Process for producing methylene dianiline A process for producing polyamines such as methylene dianiline wherein an aromatic amine such as aniline is reacted with formaldehyde in the presence of an acid catalyst sufficient water is employed to cause a separation into an aqueous phase and an organ... | 12/19/1978 |
| 4034039 | Purification of methylenedianilines A process is described for the isolation of 4,4'-diaminodiphenylmethane in substantially pure form (of the order of purity of at least 95%) from admixtures thereof with the corresponding 2,4'-isomer and 2,2'-isomer. The isomeric mixture of diamines is hea... | 07/05/1977 |
| 4029879 | Process for the removal of catalysts from polyether polyols employing water and adsorbent An improvement in the process of catalyst removal in the preparation of polyether polyols is achieved by adding a critical amount of water from about 1 to about 5 percent by weight based on the weight of polyol to an adsorbent synthetic magnesium silicate... | 06/14/1977 |
| 4029705 | Purification process for MDA A process is described for the selective removal of 2,2'- and 2,4'-diaminodiphenylmethanes from mixtures containing 2,2'-, 2,4'- and 4,4'-diaminodiphenylmethanes and polyamines by heating these mixtures in the presence of aqueous hydrochloric acid (55 to ... | 06/14/1977 |
