Patents by Inventor Mohammad Aslam
Mohammad Aslam 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: 5602285Abstract: Substituted phenethanol ethers are prepared in useful yields by the etherification of corresponding substituted phenethyl alcohols with aliphatic primary alcohols. The etherification is carried out by reacting a substituted phenethyl alcohol with an aliphatic primary alcohol in the presence of an acid catalyst at a temperature of at least about 75.degree. C.Type: GrantFiled: December 23, 1994Date of Patent: February 11, 1997Assignee: Hoechst Celanese Corp.Inventors: John R. Durrwachter, Humberto Ramos, Jr., Mohammad Aslam
-
Patent number: 5600009Abstract: The palladium-catalyzed coupling of aryl and vinyl halides with vinylic compounds is disclosed. A preferred embodiment relating to the palladium catalyzed coupling of 4-substituted and 6-substituted-2-methoxynaphthalene to form nabumetone is also disclosed. The beauty of this novel reaction is that methylvinylketone, normally employed by the art directly as-is for the preparation of nabumetone, is formed in situ. We have discovered a mechanism to take advantage of the in situ formation of methylvinylketone, thus avoiding the use of expensive, toxic, and unstable methyl vinyl ketone feed. This reaction may be employed for a variety of pharmaceutically active and non-pharmaceutical compounds.Type: GrantFiled: April 9, 1996Date of Patent: February 4, 1997Assignee: Hoechst Celanese CorporationInventors: John F. Fritch, Mohammad Aslam, Dora E. Rios, Joel C. Smith
-
Patent number: 5563300Abstract: The present invention provides a unique and novel way of producing carbinols such as 4-hydroxyphenylmethylcarbinol (HPMC). In this new process, a ketone such as 4-hydroxyacetophenone (4-HAP) is heated under suitable hydrogenation conditions of temperature and pressure in the presence of a suitable catalyst and a basic material, and for a sufficient period of time to form HPMC.Type: GrantFiled: December 7, 1995Date of Patent: October 8, 1996Assignee: Hoechst Celanese CorporationInventors: James R. Sounik, Graham N. Mott, Charles B. Hilton, Mohammad Aslam
-
Patent number: 5526703Abstract: A force detecting microsensor comprises a single crystal Si substrate, a single crystal cone formed on the substrate and a resilient electrode mounted above the tip of the Si cone. The space between the tip of the Si cone and the resilient electrode is maintained in a vacuum environment and the distance between the tip and the resilient anode is in the order of a few atomic diameters. The tunneling effect of electrons occurs between the tip of the Si cone and the resilient electrode when a potential is applied to the resilient electrode and the Si cone tip. The resilient electrode deflects as a result of the force acting on the microsensor. The deflection of the resilient electrode alters the electrical characteristics between the resilient electrode and the Si cone tip. The changes in the electrical characteristics can be measured to determine the level of force acting on the microsensor.Type: GrantFiled: August 21, 1992Date of Patent: June 18, 1996Assignee: Smiths Industries Aerospace & Defense Systems, Inc.Inventors: Mohammad Aslam, Michael D. Olinger, Jerry L. Page
-
Patent number: 5488350Abstract: Novel structures are provided including laminated layers of the diamond film in different patterns for conducting, generating and/or absorbing thermal energy. In particular, a thermal sensor/heater is shown including a doped electrically conductive diamond film layer encapsulated by layers of undoped electrically insulative layers on a silicon wafer. Also, a GaAs/Si on diamond laminate structure is provided in which the diamond film acts as a substrate and a heat sink. Notably, the diamond film structures are characterized by their high thermal conductivity, high chemical resistance, and high hardness/wear resistance due to the properties of the diamond films.Type: GrantFiled: January 7, 1994Date of Patent: January 30, 1996Assignee: Michigan State UniversityInventors: Mohammad Aslam, James V. Beck
-
Patent number: 5474808Abstract: Methods for seeding and growing diamond films on planar and non-planar surfaced substrates and also for patterning the diamond films include mixing submicron diameter diamond particles and binder particles in carriers such as photoresist or water, and applying the mixture to a substrate surface. Treatment of the substrate by chemical vapor deposition then removes the carrier and grows the dispersed diamond particles into a diamond film. Notably, diamond particles having an average size of 25 nanometers form a particularly desirable mixture since the particles do not tend to settle out of the mixture, and also since these particles result in smooth diamond films. The mixtures can be applied onto non-planar surfaces by spraying, dipping, or dispensing and jet writing, and can be applied to planar and non-planar surfaces as a complete coating, as a line, or as a pattern.Type: GrantFiled: January 7, 1994Date of Patent: December 12, 1995Assignee: Michigan State UniversityInventor: Mohammad Aslam
-
Patent number: 5424241Abstract: A force detecting microsensor comprises a single crystal Si substrate, a single crystal cone formed on the substrate and a resilient electrode mounted above the tip of the Si cone. The space between the tip of the Si cone and the resilient electrode is maintained in a vacuum environment and the distance between the tip and the resilient anode is in the order of a few atomic diameters. The tunneling effect of electrons occurs between the tip of the Si cone and the resilient electrode when a potential is applied to the resilient electrode and the Si cone tip. The resilient electrode deflects as a result of the force acting on the microsensor. The deflection of the resilient electrode alters the electrical characteristics between the resilient electrode and the Si cone tip. The changes in the electrical characteristics can be measured to determine the level of force acting on the microsensor.Type: GrantFiled: June 14, 1994Date of Patent: June 13, 1995Assignee: Smiths Industries Aerospace & Defense Systems, Inc.Inventors: Mohammad Aslam, Michael D. Olinger, Jerry L. Page
-
Patent number: 5413668Abstract: Methods for making mechanical and micro-electromechanical devices (a) forming a mold having a base and metallic walls defining a molding space therebetween, the base being exposed between the metallic walls and either being capable of or having a nucleating upper surface capable of nucleating the deposition of a structural material which does not nucleate on or adhere to the metallic walls at conditions of deposition; (b) depositing a structural material onto either the nucleating upper surface or base and filling to a predetermined height to form a strong solid body; and (c) removing the metallic walls, leaving free-standing, solid body walls of structural material attached to the base; another embodiment of the method may include step (a) and steps (b) filling the molding space with a diamond-nucleating material; (c) consolidating the diamond-nucleating material so as to form a strong solid body; and (d) removing the metallic walls, and thereby freeing the solid body, by dissolving the metallic walls with aType: GrantFiled: October 25, 1993Date of Patent: May 9, 1995Assignee: Ford Motor CompanyInventors: Mohammad Aslam, Michael A. Tamor
-
Patent number: 5344980Abstract: Novel 4-substituted acetophenone anils and methods for preparing 1,3,5-tris(4'-hydroxyphenyl)benzenes from 4-substituted acetophenones such as 4-hydroxyacetophenones or, from substituted 4-hydroxyacetophenone-anils such as 4-hydroxyacetophenone-anil by reacting the 4-substituted acetophenone or corresponding anil with an aniline derivative.Type: GrantFiled: November 23, 1993Date of Patent: September 6, 1994Assignee: Hoechst Celanese Corp.Inventors: Mohammad Aslam, William Basinger
-
Patent number: 5300698Abstract: Novel 4-substituted acetophenone anils and methods for preparing 1,3,5-tris(4'-hydroxyphenyl)benzenes from 4-substituted acetophenones such as 4-hydroxyacetophenones or, from substituted 4-hydroxyacetophenone-anils such as 4-hydroxyacetophenone-anil by reacting the 4-substituted acetophenone or corresponding anil with an aniline derivative.Type: GrantFiled: May 27, 1993Date of Patent: April 5, 1994Assignee: Hoechst Celanese CorporationInventors: Mohammad Aslam, William Basinger
-
Patent number: 5247124Abstract: A process for preparing a substituted styrene by reacting a bisarylalkyl ether in the presence of an acid catalyst is disclosed. The process is preferably used for the preparation of 4-acetoxystyrene from 4,4'-(oxydiethylidene)bisphenol diacetate and 4-methoxystyrene from 4,4'-(oxydiethylidene)bisphenol dimethyl ether. A process for preparing a bisarylalkyl ether by reacting a corresponding arylalkanol in the presence of an acid catalyst is also disclosed.Type: GrantFiled: August 25, 1992Date of Patent: September 21, 1993Assignee: Hoechst Celanese CorporationInventors: Mohammad Aslam, Brad L. Smith, George Kvakovszky
-
Patent number: 5225603Abstract: An intermediate for the manufacture of nabumetone, 4-(6'-methoxy-2'-naphthyl)-3-buten-2-one, is prepared by contacting 2-bromo-6-methoxynaphphalene with methyl vinyl ketone in the presence of a palladium catalyst at from about 50.degree. C. to about 200.degree. C. for a time sufficient to cause substantially complete reaction to occur.Type: GrantFiled: June 17, 1988Date of Patent: July 6, 1993Assignee: Hoechst Celanese CorporationInventors: Mohammad Aslam, Varadaraj Elango
-
Patent number: 5210278Abstract: A process for preparing a substituted styrene by reacting a bisarylalkyl ether in the presence of an acid catalyst is disclosed. The process is preferably used for the preparation of 4-acetoxystyrene from 4,4'-(oxydiethylidene)bisphenol diacetate and 4-methoxystyrene from 4,4'-(oxydiethylidene)bisphenol dimethyl ether. A process for preparing a bisarylalkyl ether by reacting a corresponding arylalkanol in the presence of an acid catalyst is also disclosed.Type: GrantFiled: August 25, 1992Date of Patent: May 11, 1993Assignee: Hoechst Celanese CorporationInventors: Mohammad Aslam, Brad L. Smith, George Kvakovszky
-
Patent number: 5194672Abstract: A process for preparing a substituted styrene by reacting a bisarylalkyl ether in the presence of an acid catalyst is disclosed. The process is preferably used for the preparation of 4-acetoxystyrene from 4,4'-(oxydiethylidene)bisphenol diacetate and 4-methoxystyrene from 4,4'-(oxydiethylidene)bisphenol dimethyl ether. A process for preparing a bisarylalkyl ether by reacting a corresponding arylalkanol in the presence of an acid catalyst is also disclosed.Type: GrantFiled: May 14, 1991Date of Patent: March 16, 1993Assignee: Hoechst Celanese CorporationInventors: Mohammad Aslam, Brad L. Smith, George Kvakovszky
-
Patent number: 5151540Abstract: A method is provided for preparing N-acylaminothiophenols, e.g., N-acetyl-para-aminothiophenol, or aminothiophenols, e.g., para-aminothiophenol, or N,S-diacylaminothiophenols, e.g., N,S-diacetyl-para-aminothiophenol, by reacting any of certain sulfur-containing ketones, viz., an S-(acylaryl) N,N-di(organo)thiocarbamate, e.g., S-(4'-acetophenyl)-N,N-dimethylthiocarbamate, an acylthiophenol acylate ester, e.g., 4-acetothiophenol acetate, or a free acylthiophenol, e.g., 4-acetothiophenol with hydroxylamine or a hydroxylamine salt, to form the oxime of the ketone, subjecting the oxime to a Beckmann rearrangement in the presence of a catalyst to form an S-(N-acyl-aminoaryl) N,N-di(organo)thiocarbamate, e.g., S-(N-acetyl-para-aminophenyl) N,N-dimethylthiocarbamate, an N,S-diacylaminothiophenol, e.g., N,S-diacetyl-paraaminothiophenol, or an N-acyl aminothiophenol, e.g., N-acetyl-para-aminothiophenol, respectively.Type: GrantFiled: November 26, 1986Date of Patent: September 29, 1992Assignee: Hoechst Celanese CorporationInventors: Mohammad Aslam, Kenneth G. Davenport
-
Patent number: 5132437Abstract: 1-Aminoanthraquinone (1-AAQ) is synthesized by the reaction of 2-chlorobenzyl chloride and xylene in the presence of a solid acid catalyst to yield 2-chloro dimethyldiphenylmethane, subsequent oxidation of the methyl groups, ring closure to form a 1-chloroanthraquinone carboxylic acid, replacement of the 1-chloro group with ammonia, and decarboxylation.Type: GrantFiled: February 12, 1991Date of Patent: July 21, 1992Assignee: Hoechst Celanese CorporationInventors: Mohammad Aslam, Daniel A. Aguilar
-
Patent number: 5130448Abstract: 1-Aminoanthraquinone (1-AAQ) is synthesized by the condensation of 2-substituted benzoic acid and xylene to yield 2-substituted-dimethylbenzophenone, subsequent oxidation of the methyl groups, ring closure to form a 1-substituted anthraquinone carboxylic acid, replacement of the 1-substituent with ammonia, and decarboxylation.Type: GrantFiled: February 12, 1991Date of Patent: July 14, 1992Assignee: Hoechst Celanese CorporationInventors: Mohammad Aslam, Daniel A. Aguilar
-
Patent number: 5087769Abstract: A method of forming 6-substituted-2-vinyl naphthalene from a 2-substituted naphthalene compound wherein the substituent in the 2-position is an ortho-para directing electron-donating group not reactive with hydrogen fluoride, comprises contacting the naphthalene compound and an acylating agent with substantially anhydrous hydrogen fluoride to acylate the naphthalene compound to a 6-substituted-2-acylnaphthalene compound, hydrogenating the 6-substituted-2-acylnaphthalene compound to convert the 2-acyl substituent to an alcohol substituent, dehydrating the product of hydrogenation in the presence of a free radical inhibitor to convert the alcohol substituent to an olefinic substituent, and isolating the formed 6-substituted-2-vinylnaphthalene subsequent to the dehydration.Type: GrantFiled: September 26, 1990Date of Patent: February 11, 1992Assignee: Hoechst Celanese CorporationInventors: Mohammad Aslam, Henry C. Linstid, III., Kenneth G. Davenport
-
Patent number: 5072025Abstract: 3-substituted-4-hydroxy- and 4-acetoxystyrene compounds, especially 3,5-di(methyl, bromo or chloro)-4-acetoxystyrene as well as a process for its preparation. 2,6-dimethylphenol is acylated with acetic anhydride and HF catalyzed to produce 3,5-dimethyl-4-hydroxy-acetophenone. After subsequent esterification with acetic anhydride and catalyzed hydrogenation to form 1-(3',5'-dimethyl-4'-acetoxyphenyl)ethanol, this intermediate is then dehydrated with an acid and a polymerization inhibitor to produce 3,5-dimethyl-4-acetoxystyrene.Type: GrantFiled: July 26, 1990Date of Patent: December 10, 1991Assignee: Hoechst Celanese CorporationInventors: Richard Vicari, Mohammad Aslam, Wilson B. Ray, Kenneth G. Davenport, Ralph Dammel, Juergen Lingnau, Karl-Friedrich Doessel
-
Patent number: 5041614Abstract: A method for the preparation of 4-acetoxystyrene is disclosed. The method comprises heating 4'-acetoxyphenylmethylcarbinol in the presence of a suitable acid anhydride and a suitable dehydration catalyst in a continuous feed reaction mode to make the 4-acetoxystyrene.Type: GrantFiled: July 3, 1990Date of Patent: August 20, 1991Assignee: Hoechst Celanese CorporationInventors: Mohammad Aslam, Charles B. Hilton