Patents by Inventor Alexander Hagen
Alexander Hagen 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).
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Patent number: 7792527Abstract: A handoff key is provided for facilitating a hand off of a wireless terminal from a first access point to a second access point. The handoff key may be generated by a server and communicated to the first and second access points. Alternatively, the handoff key may be generated one of the access points and transmitted to the other access point. The first access point may transmit the handoff key to the wireless terminal before the handoff. Shortly after the handoff, the wireless terminal and the second access point may communicate data encrypted with the handoff key. Later, an authentication server may authenticate the wireless terminal, causing the second access point to provide the wireless terminal with a session key. Thereafter, the wireless terminal and the second access point may communicate data encrypted with the session key.Type: GrantFiled: November 8, 2002Date of Patent: September 7, 2010Assignee: NTT Docomo, Inc.Inventors: Gang Wu, Fujio Watanabe, Alexander Hagen
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Publication number: 20040203783Abstract: A handoff key is provided for facilitating a hand off of a wireless terminal from a first access point to a second access point. The handoff key may be generated by a server and communicated to the first and second access points. Alternatively, the handoff key may be generated one of the access points and transmitted to the other access point. The first access point may transmit the handoff key to the wireless terminal before the handoff. Shortly after the handoff, the wireless terminal and the second access point may communicate data encrypted with the handoff key. Later, an authentication server may authenticate the wireless terminal, causing the second access point to provide the wireless terminal with a session key. Thereafter, the wireless terminal and the second access point may communicate data encrypted with the session key.Type: ApplicationFiled: November 8, 2002Publication date: October 14, 2004Inventors: Gang Wu, Fujio Watanabe, Alexander Hagen
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Publication number: 20030167329Abstract: A communication system includes one or more independent communication networks. Each network includes one or more resource management devices, resources managed by the resource management device, and one or more resource arbitration servers. The communication system further includes a communication device adapted for communication on each of the one or more communication networks.Type: ApplicationFiled: March 1, 2002Publication date: September 4, 2003Applicant: DoCoMo Communications Laboratories USA, Inc.Inventors: Shoji Kurakake, William Alexander Hagen
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Publication number: 20020168962Abstract: A method and system for providing a customized service in a communication network is disclosed. An initial service request is generated with a terminal. The initial service request is then sent to a service provider server that is connected to the terminal. The initial service request is then analyzed with the service provider server, wherein the step of analyzing the initial service request comprises the steps of: (a) authenticating the terminal to verify that the terminal is authorized to conduct communication on the communication network; (b) ensuring service availability for the terminal by retrieving a service identifier for the terminal from a user information database located on the service provider server; (c) generating an authentication notification based on the results of steps (a) and (b) with the service provider server; and transmitting the authentication notification to the terminal from the service provider server.Type: ApplicationFiled: May 9, 2001Publication date: November 14, 2002Applicant: DoCoMo Communications Laboratories USAInventors: Shoji Kurakake, William Alexander Hagen
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Publication number: 20020161921Abstract: A communication system includes a communication device and a communication server. A network of the communication system may include multiple access measures. The communication device is capable of connecting the network using multiple access measures and a server connects to the network. A set network-access measure is used to communicate with the server and the server provides information to the communication device such as the availability of various network-access measures, authentication-key information and communication software for the communication device to use.Type: ApplicationFiled: April 27, 2001Publication date: October 31, 2002Applicant: DoCoMo Communications Laboratories USA, Inc.Inventors: Shoji Kurakake, William Alexander Hagen
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Publication number: 20020075844Abstract: A system and method are disclosed for providing ubiquitous public network access to wireless, mobile terminals using private networks having private network access points and connections with the public network. The wireless, mobile terminals are permitted to use wireless, radio frequency communication devices comprising private network access points. A network access server (NAS) is associated with each wireless, radio frequency communication device and provides an interface between the wireless, mobile terminals and the private network. The NAS controls registration of wireless, mobile terminals as subscribers, and provides public network access to the mobile terminals through the private network's access point and public network connection. The NAS also restricts access by the mobile terminals to the private network, meters network useage by the mobile terminals, and controls use of bandwidth by the mobile terminals.Type: ApplicationFiled: April 10, 2001Publication date: June 20, 2002Inventor: W. Alexander Hagen
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Patent number: 5108913Abstract: .alpha.-Amylase is determined by the enzymatic splitting of an .alpha.-amylase substrate and measurement of a fission product, wherein there is used as a substrate a maltoheptaose compound of the formula ##STR1## wherein R is a glucoside, phenylglucoside, mononitrophenylglucoside, dinitrophenylglucoside, sorbitol or gluconic acid group. Reagents comprising such a substrate and a system for the determination of a fission product formed from the amylase substrate by .alpha.-amylase, are also provided. A process for the preparation of a maltoheptaose will Bacillus macerans amylase, free of p-nitrophenyl-alpha-glucoside splitting activity is disclosed.Type: GrantFiled: June 27, 1990Date of Patent: April 28, 1992Assignee: Boehringer Mannheim GmbHInventors: Elli Rauscher, Ulrich Neumann, August W. Wahlefeld, Alexander Hagen, Wolfgang Gruber, Joachim Ziegenhorn, Eugen Schaich, Ulfert Deneke, Michal Gerhard, Gunter Weimann
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Patent number: 4544631Abstract: .alpha.-Amylase is determined by the enzymatic splitting of an .alpha.-amylase substrate and measurement of a fission product, wherein there is used as a substrate a maltoheptaose compound of the formula ##STR1## wherein R is a glucoside, phenylglucoside, mononitrophenylglucoside, dinitrophenylglucoside, sorbitol or gluconic acid group. Reagents comprising such a substrate and a system for the determination of a fission product formed from the amylase substrate by .alpha.-amylase, are also provided.Type: GrantFiled: October 16, 1981Date of Patent: October 1, 1985Assignee: Boehringer Mannheim GmbHInventors: Elli Rauscher, Ulrich Neumann, August W. Wahlefeld, Alexander Hagen, Wolfgang Gruber, Joachim Ziegenhorn, Eugen Schaich, Ulfert Deneke, Gerhard Michal, Gunter Weimann
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Patent number: 4279991Abstract: The invention provides a process for the production of reagent solutions containing a plurality of components for analytical purposes, wherein the individual components of several differently composed reagents are each introduced into a solid, proportionable carrier material in easily redissolvable form in such an amount that each part by volume or weight of the carrier material carries a definite amount of one reagent component, the carriers of the components are brought together in a magazine-like manner and, for the production of a particular reagent, from all carriers which carry a component of the reagent, there are simultaneously taken off the amounts corresponding to the required amounts of the components, which are then dissolved to form the reagent solution. Apparatus for carrying out the process is also provided.Type: GrantFiled: December 4, 1979Date of Patent: July 21, 1981Assignee: Boehringer Mannheim GmbHInventors: Alexander Hagen, Hermann Edelmann, Sigmar Klose
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Patent number: 4268628Abstract: Novel method for the determination of .alpha.-amylase which method comprises contacting a sample suspected of containing .alpha.-amylase with a starch derivative carrying a substituent capable of dyestuff-forming coupling; separating from the resulting starch-containing phase the low molecular weight soluble fission products formed by splitting of said starch derivative by .alpha.-amylase; coupling the said couplable substituent with another dyestuff forming component; and measuring the dyestuff so formed as a measure of the initial .alpha.-amylase content.Type: GrantFiled: March 19, 1979Date of Patent: May 19, 1981Assignee: Boehringer Mannheim GmbHInventors: Sigmar Klose, Hans-Georg Batz, Michael Stoltz, Alexander Hagen, Gunter Weimann
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Patent number: 4247630Abstract: The invention relates to an improvement in a conventional method for the determination of uric acid involving uricase/catalase/aldehyde dehydrogenase, resulting in the formation of produced NAD(P)H as a measure of the initial uric acid present, which improvement comprises adding at least one compound selected from oxalates, malonic acid mono-lower alkyl esters, trihaloethanols, pyrazole, pyridine, substituted pyrazole and pyridine wherein the substituents are selected from lower alkyl and halogen, pyridine carboxylic acids, pyridine carboxylic acids substituted with a lower radical, pyridine carboxylic acid amides and pyridine carboxylic acid lower alkyl esters, thiourea, isobutyramide and chelate-forming complexing agents, in order to suppress disturbance-causing creep reactions in said method. Reagents containing such additive compounds are also provided.Type: GrantFiled: March 31, 1978Date of Patent: January 27, 1981Assignee: Boehringer Mannheim GmbHInventors: Joachim Ziegenhorn, Eberhard Munz, Brigitte Draeger, Alexander Hagen, Wolfgang Gruber
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Patent number: 4229527Abstract: Kinetic determination of enzyme substrates by means of coupled reactions comprising selecting the reaction parameters so that the most specific part reaction of a reaction sequence becomes rate-determining for the whole reaction sequence wherein the rate-determining part reaction follows first or pseudo-first order kinetics.Type: GrantFiled: October 23, 1978Date of Patent: October 21, 1980Assignee: Boehringer Mannheim GmbHInventors: Joachim Ziegenhorn, August W. Wahlefeld, Alexander Hagen, Wolfgang Gruaber, Hans U. Bergmeyer
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Patent number: 4212938Abstract: Cholesterol is determined by incubating a sample suspected of containing cholesterol in an aqueous medium with cholesterol oxidase and determining either the oxygen consumption, the hydrogen peroxide formed, or cholestenone, as a measure of the initial cholesterol content; reagent compositions comprising cholesterol oxidase and a system for the determination of H.sub.2 O.sub.2 or for the determination of cholestenone are provided.Type: GrantFiled: May 15, 1973Date of Patent: July 15, 1980Assignee: Boehringer Mannheim GmbHInventors: Wolfgang Gruber, Hans U. Bergmeyer, Erich Bernt, Alexander Hagen, Peter Roeschlau, Gunter Lang, Klaus Beaucamp
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Patent number: 4153513Abstract: Enzyme substrates in aqueous liquids are continuously measured by introducing a sample containing the substrate to be determined into a current of buffer solution, reacting the substrate on an immobilized enzyme and measuring, in a measurement chamber, a physical change in the solution brought about by the reaction, wherein a current of buffer solution containing the sample to be determined is passed alternatingly (i) directly through the measurement chamber with the production of a reference signal and (ii) first over the immobilized enzyme and thereafter through the measurement chamber with the production of a measurement signal, and relating the reference signal to the measurement signal to indicate the enzyme substrate initially present.Type: GrantFiled: August 19, 1977Date of Patent: May 8, 1979Assignee: Boehringer Mannheim GmbHInventors: Hermann Edelmann, Peter Kraft, Karlheinz Mann, Peter Schuler, Alexander Hagen
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Patent number: 4134943Abstract: Porous tablets are produced by mixing the tablet components with a liquid solvent which is inert towards the components of the tablet and which freezes at a temperature from about -30 to +25.degree. C, the solvent constituting about 5 to 80% by weight of the total mixture, introducing the mixture into an inert cooling medium at a temperature low enough to solidify the solvent, pressing the mixture including the solidified solvent into tablets at a temperature below the freezing point of the solvent, and then evaporating the solvent from the tablets. Advantageously the solvent is water, cyclohexane, benzene and/or tert.-butanol, optionally containing alcohol. The tablets readily disintegrate in liquid.Type: GrantFiled: December 3, 1976Date of Patent: January 16, 1979Assignee: Boehringer Mannheim GmbHInventors: Karl-Wolfgang Knitsch, Alexander Hagen, Eberhard Munz, Helmut Determann
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Patent number: 4102742Abstract: Process for enzymatic analysis by the enzymatic reaction of a substance to be determined and measurement of the increase or decrease of a reaction component of the main reaction or subsequent reaction, comprising adding to a solution which contains dissolved therein the enzyme necessary for the reaction, a sample solution containing a substance to be determined, measuring a particular reaction component, and then circulating the enzyme solution through a reactor which completely removes the measured reaction component from the solution (or converts it to a non-disturbing product) and again mixing the enzyme solution, if necessary after replenishing the used up components, with a new sample solution.Type: GrantFiled: June 3, 1976Date of Patent: July 25, 1978Assignee: Boehringer Mannheim GmbHInventors: Sigmar Klose, Alexander Hagen
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Patent number: 4019961Abstract: An analytical process for enzymatic determination of a substrate in biological fluids. The fluid sample is reacted first in the absence of the specific kinase but in the presence of an NADH -- regenerating enzymatic system with the reagents needed for the reaction sequence; then the enzymes are separated from the reaction solution, and thereafter the necessary enzymes are added to the filtrate and NADH consumption is measured.The method is very accurate, economical in requiring less enzymes and only one measurement is necessary.Type: GrantFiled: March 10, 1975Date of Patent: April 26, 1977Assignee: Boehringer Mannheim G.m.b.H.Inventors: Sigmar Klose, August Wilhelm Wahlefeld, Alexander Hagen