Patents by Inventor Saeed Ahmad

Saeed Ahmad 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).

  • FAST TRACKING PLL WITH ANALOG MIXER FOR PHASE DETECTION
    Publication number: 20250023571
    Abstract: A fast-tracking phase-locked-loop (PLL) with an analog mixer for phase detection and correction is provided. A frequency lock loop architecture as described herein is used for a PLL that can lock the phase of a local oscillator to an input reference signal of arbitrarily high frequency, even if the local oscillator and the input reference signal frequencies are originally very far apart. To accommodate arbitrarily high frequency input reference signals, embodiments use an analog mixer for the phase detector, rather than a phase-frequency detector (PFD). The analog mixer can be designed to operate on input signals with frequencies of 10's of GHz, whereas the PFD is limited to input frequencies of less than 1 GHz. Embodiments use a new architecture utilizing the concept of Hartley Image Rejection receiver architecture in a frequency lock loop, which enables the PLL to adjust the local oscillator frequency to be brought within the frequency locking range of the analog mixer.
    Type: Application
    Filed: November 30, 2022
    Publication date: January 16, 2025
    Applicant: ARIZONA BOARD OF REGENTS ON BEHALF OF ARIZONA STATE UNIVERSITY
    Inventors: Saeed Zeinolabedinzadeh, Matthew Kinsinger, Waleed Ahmad
  • High-yielding continuous flow synthesis of antimalarial drug hydroxychloroquine
    Patent number: 12071410
    Abstract: Cost effective, semi-continuous flow methods and systems for synthesizing the antimalarial drug hydroxychloroquine (HCQ) in high yield are provided. The synthesis method that uses simple, inexpensive reagents to obtain the crucial intermediate 5-(ethyl(2-hydroxyethyl)-amino)pentan-2-one, vertical-integration of the starting material 5-iodopentan-2-one and the integration of continuous stirred tank reactors.
    Type: Grant
    Filed: February 25, 2019
    Date of Patent: August 27, 2024
    Assignee: Virginia Commonwealth University
    Inventors: Frank B. Gupton, Saeed Ahmad, Hari P. R. Gunuru, Nakul S. Telang
  • HIGH-YIELDING CONTINUOUS FLOW SYNTHESIS OF ANTIMALARIAL DRUG HYDROXYCHLOROQUINE
    Publication number: 20200407321
    Abstract: Cost effective, semi-continuous flow methods and systems for synthesizing the antimalarial drug hydroxychloroquine (HCQ) in high yield are provided. The synthesis method that uses simple, inexpensive reagents to obtain the crucial intermediate 5-(ethyl(2-hydroxyethyl)-amino)pentan-2-one, vertical-integration of the starting material 5-iodopentan-2-one and the integration of continuous stirred tank reactors.
    Type: Application
    Filed: February 25, 2019
    Publication date: December 31, 2020
    Inventors: Frank B. GUPTON, Saeed AHMAD, Hari P.R. GUNURU, Nakul S. TELANG
  • Process for making 5,11-Dihydro-11-ethyl-5-methyl-8{2-{(1-oxido-4-quinolinyl)oxy}ethyl}-6H-di pyrido[3,2-b:2?,3?-e][1,4]diazepin-6-one
    Patent number: 7282583
    Abstract: An improved process for making 5,11-dihydro-11-ethyl-5-methyl-8-{2-{(1-oxido-4-quinolinyl)oxy}ethyl}-6H-di pyrido[3,2-b:2?,3?-e][1,4]diazepin-6-one.
    Type: Grant
    Filed: November 16, 2006
    Date of Patent: October 16, 2007
    Assignee: Boehringer Ingelheim International GmbH
    Inventors: Saeed Ahmad, Robert Frederick Boswell, Jr., Jack Delbert Brown, Cary Mark Davis, Kai Oliver Donsbach, Bernard Franklin Gupton, Christopher Peter Johnson, III, Ahmad Khodabocus, Vithalanand R. Kulkarni, Young S. Lo
  • Process for making 5,11-Dihydro-11-ethyl-5-methyl-8-{2-{(1-oxido-4-quinolinyl)oxy}ethyl}-6H-di pyrido[3,2-b:2',3'-e][1,4]diazepin-6-one
    Publication number: 20070129542
    Abstract: An improved process for making 5,11-dihydro-11-ethyl-5-methyl-8-{2-{(1-oxido-4-quinolinyl)oxy}ethyl}-6H-di pyrido[3,2-b:2?,3?-e][1,4]diazepin-6-one.
    Type: Application
    Filed: November 16, 2006
    Publication date: June 7, 2007
    Inventors: Saeed Ahmad, Robert Boswell, Jack Brown, Cary Davis, Kai Donsbach, Bernard Gupton, Christopher Johnson, Ahmad Khodabocus, Vithalanand Kulkarni, Young Lo