Patents by Inventor Hamdy Khalil
Hamdy Khalil 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: 8931688Abstract: A system and method for currency validation of a bank note with a radio frequency identification device therein utilizes a computer, server and communication link and a smartphone including an RFID reader, transmitter/receiver and an internet connection. A bank note is issued with a value, a serial number and a secret seed message that is also saved on the issuer's server. A tamper proof RFID mu-chip is embedded in the currency note and includes the value, serial number, plus the secret message for making a calculation. The smartphone reads the information on the chip and requests an issuer/authenticator to validate the note. The issuer/authenticator transmits a challenge and the mu-chip calculates an answer that is sent to the issuer/authenticator. An approval or disapproval is then sent to the smartphone.Type: GrantFiled: September 12, 2012Date of Patent: January 13, 2015Assignee: King Saud UniversityInventors: Mohamed Hamdy Khalil Eldefrawy, Muhammad Khurram Khan
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Patent number: 8683564Abstract: Systems and methods for One-Time Password (OTP) authentication with infinite nested hash chains are described. In one aspect, a methodology includes a client device that provides a one-time password (OTP) authentication server with certain registration information. The client device generates, via the OTP authentication server, an authenticated OTP with infinite nested hash chains, These generating operations use a first hash function (hA (?)) for updating a seed chain, a second hash function (hB (•)) for OTP production, an OTP seed number stOTP for a tth authentication, and two authentication seeds of numbers s2t?1Auth and s2tAuth, for the tth authentication.Type: GrantFiled: November 17, 2010Date of Patent: March 25, 2014Assignee: King Saud UniversityInventors: Muhammad Khurram Khan, Mohamed Hamdy Khalil Eldefrawy, Khaled Soliman Alghathbar
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Publication number: 20140069997Abstract: A system and method for currency validation of a bank note with a radio frequency identification device therein utilizes a computer, server and communication link and a smartphone including an RFID reader, transmitter/receiver and an internet connection. A bank note is issued with a value, a serial number and a secret seed message that is also saved on the issuer's server. A tamper proof RFID mu-chip is embedded in the currency note and includes the value, serial number, plus the secret message for making a calculation. The smartphone reads the information on the chip and requests an issuer/authenticator to validate the note. The issuer/authenticator transmits a challenge and the mu-chip calculates an answer that is sent to the issuer/authenticator. An approval or disapproval is then sent to the smartphone.Type: ApplicationFiled: September 12, 2012Publication date: March 13, 2014Applicant: KING SAUD UNIVERSITYInventors: Mohamed Hamdy Khalil Eldefrawy, Muhammad Khurram Khan
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Publication number: 20130191899Abstract: Systems and methods for One-Time Password (OTP) authentication with infinite nested hash chains are described. In one aspect, a methodology includes a client device that provides a one-time password (OTP) authentication server with certain registration information. The client device generates, via the OTP authentication server, an authenticated OTP with infinite nested hash chains, These generating operations use a first hash function (hA (?)) for updating a seed chain, a second hash function (hB (•)) for OTP production, an OTP seed number stOTP for a tth authentication, and two authentication seeds of numbers s2t?1Auth and s2tAuth, for the tth authentication.Type: ApplicationFiled: November 17, 2010Publication date: July 25, 2013Applicant: KING SAUD UNIVERSITYInventors: Mohamed Hamdy Khalil Eldefrawy, Khaled Soliman Alghathbar, Muhammad Khurram Khan
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Publication number: 20100184879Abstract: There is described a novoel isocyanate-based polymer foam. The isocyanate-based polymer foam is derived from a reaction mixture comprising: (a) an isocyanate; (b) a mixture of active hydrogen-containing compounds; and (c) a blowing agent. The mixture of active hydrogen-containing compounds comprises: (i) a bio-based polyol having an OH functionality of greater than about 2.0, an OH number in the range of from about 90 to about 200 and a molecular weight (Mn) of at least about 1100, and (ii) a petroleum-based active hydrogen-containing compound. It has been surprisingly and unexpectedly discovered that relatively high amounts (compared to the prior art) of such a bio-based polyol may be incorporated into an isocyanate-based polymer foam while maintaining a desirable balance of properties in the foam.Type: ApplicationFiled: March 3, 2008Publication date: July 22, 2010Inventors: Romeo Stanciu, Paul V. Farkas, Hamdy Khalil, Askar Karami
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Patent number: 5288797Abstract: A one-part moisture curable polyurethane adhesive composition comprises a blend of polyurethane prepolymers and one or more additives which unexpectedly improve the sag resistance and mechanical properties of the formulation. The final adhesive composition retains good stability in the absence of moisture for an extended period between manufacture and application of the adhesive, and has a relatively rapid and consistent cure rate in the presence of atmospheric moisture. The final cured composition exhibits good mechanical properties and generally is unaffected by ambient application and cure conditions.Type: GrantFiled: March 19, 1993Date of Patent: February 22, 1994Assignee: Tremco Ltd.Inventors: Hamdy Khalil, Witek Majewski, George Nickel, George Wypych, Jeffrey D. van Heumen
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Patent number: 5126421Abstract: Isocyanate prepolymer compositions can be cured quickly and thoroughly in the presence of atmospheric moisture by reacting them with a curing system that includes a mixture of (1) an oxazolidine moisture scavenger and curing agent and (2) a hydroxyl curing agent. The oxazolidine moisture scavenger/curing agent can be monocyclic oxazolidine or bicyclic oxazolidine. The hydroxyl curing agent preferably is a polyhydric compound. If desired, an organic solvent, a catalyst, and/or fillers can be used with the invention in order to speed the curing reaction or improve the physical and mechanical properties of the final polymer product. The present invention enables high quality polyurethane/polyurea polymers to be formed in thick layers under various environmental conditions, including humidity, that render the invention suitable for use in the field.Type: GrantFiled: April 27, 1990Date of Patent: June 30, 1992Assignee: 501 Tremco Ltd.Inventors: Witek Majewski, Hamdy Khalil, Jerzy Wypych
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Patent number: 4533691Abstract: An improved method is provided for inhibiting the growth of microorganisms in a latex comprising homopolymers of C.sub.4-6 conjugated diolefins, acrylic polymers, vinyl acetate polymers, chloroprene polymers, vinyl pyridine polymers, homopolymers of vinylidene monoaromatic monomers, copolymers of ethylene and propylene, copolymers of acrylonitrile and butadiene or copolymers of butadiene and styrene, copolymers of butadiene and styrene containing one or more monomers selected from the group alpha-beta ethylenically unsaturated aldehydes, alpha-beta ethylenically unsaturated carboxylic acids, amide derivatives of alpha-beta ethylenically unsaturated acids which may be unsubstituted or substituted at the nitrogen atom by a C.sub.1-8 alkyl or a C.sub.1-4 alkanol radical, or a C.sub.Type: GrantFiled: December 12, 1983Date of Patent: August 6, 1985Assignee: Polysar LimitedInventors: Hamdy Khalil, Orest N. Chick
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Patent number: 4404300Abstract: A process is provided for the production of an improved impact polystyrene by the use of a polybutadiene which contains an optical brightener as the rubber to be dissolved in the styrene monomer, following which the polybutadiene-styrene solution is polymerized.Type: GrantFiled: February 16, 1982Date of Patent: September 13, 1983Assignee: Polysar LimitedInventors: Unto K. Koski, Hamdy Khalil, Adrian Cassola