Patents by Inventor Al-Hafeez Z. Dhalla

Al-Hafeez Z. Dhalla 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: 10791255
    Abstract: A scanning optical system is provided including a source of optical radiation; an optical scanning beam delivery system for delivering optical radiation to a subject, wherein the optical scanning beam delivery system includes a plurality of optical elements including at least one steerable mirror; at least one actuator coupled to the at least one steerable mirror; a detection system for detecting optical radiation returned from a subject; a communications device including a user interface and configured to process a set of instructions at least partially responsive to inputs from the user interface; a controller comprising memory, a microcontroller and an field programmable gate array (FPGA), the microcontroller and FPGA receiving instructions derived from the communications device; and at least one actuator coupled to the at least one steerable mirror.
    Type: Grant
    Filed: November 6, 2015
    Date of Patent: September 29, 2020
    Assignee: Leica Microsystems Inc.
    Inventors: Mehran Ghofrani, Al-Hafeez Z. Dhalla, Christopher Saxer
  • Patent number: 10409046
    Abstract: Field diaphragms for use in surgical microscopes are provided. The field diaphragms are positioned along an optical axis of a microscope illumination system. The field diaphragms include a frame portion configured to be received by the surgical microscope; and a non-circularly symmetric mask portion integrated with the frame portion. The mask portion is aligned such that marginal rays from an edge of the field diaphragm along a meridian of minimum diameter that reflect from a surface of an objective lens of the microscope reflect outside of an acceptance angle for relay through any ocular channel of the microscope.
    Type: Grant
    Filed: November 9, 2015
    Date of Patent: September 10, 2019
    Assignee: Bioptigen, Inc.
    Inventors: Christopher Saxer, Al-Hafeez Z. Dhalla, Robert H. Hart, Eric L. Buckland
  • Publication number: 20190200854
    Abstract: A model eye for use with an imaging system is provided. The model eye includes a shape that mimics a shape of a real eye of a subject and focal parameters of the real eye of the subject. The model eye is positioned in the imaging system in place of the real eye to assess and/or calibrate the imaging system. Related methods, systems and devices are also provided herein.
    Type: Application
    Filed: January 3, 2018
    Publication date: July 4, 2019
    Inventors: Andrew Murnan, Nestor O. Farmiga, Christopher Saxer, Al-Hafeez Z. Dhalla, Eric L. Buckland, Robert H. Hart
  • Patent number: 10048057
    Abstract: An optical coherence tomography (OCT) system including a source of broadband optical radiation and a beamsplitter coupled to the source is provided. The beamsplitter divides the source radiation into a reference path and a sample path. The reference path includes an optical switch to switch the reference path between a first path having a first reference reflection at a first reference optical path length and a second path having a second reference reflection at a second reference optical path length. The system further includes a beam combiner that mixes source radiation reflected from a subject in the sample path with source radiation returned from the first reference reflection and the second reference reflection. A detection system detects a first wavelength dependent interferogram during the first time interval and a second wavelength dependent interferogram during the second time interval. A processor preconditions the first and second wavelength dependent interferograms.
    Type: Grant
    Filed: June 23, 2016
    Date of Patent: August 14, 2018
    Assignee: Bioptigen, Inc.
    Inventors: Eric L. Buckland, Al-Hafeez Z. Dhalla, Nestor O. Farmiga, Mehran Ghofrani, Robert H. Hart, Andrew Murnan, Christopher Saxer
  • Publication number: 20170347001
    Abstract: A scanning optical system is provided including a source of optical radiation; an optical scanning beam delivery system for delivering optical radiation to a subject, wherein the optical scanning beam delivery system includes a plurality of optical elements including at least one steerable mirror; at least one actuator coupled to the at least one steerable mirror; a detection system for detecting optical radiation returned from a subject; a communications device including a user interface and configured to process a set of instructions at least partially responsive to inputs from the user interface; a controller comprising memory, a microcontroller and an field programmable gate array (FPGA), the microcontroller and FPGA receiving instructions derived from the communications device; and at least one actuator coupled to the at least one steerable mirror.
    Type: Application
    Filed: November 6, 2015
    Publication date: November 30, 2017
    Applicant: Bioptigen, inc.
    Inventors: Mehran GHOFRANI, Al-Hafeez Z. DHALLA, Christopher SAXER
  • Publication number: 20170131533
    Abstract: Field diaphragms for use in surgical microscopes are provided. The field diaphragms are positioned along an optical axis of a microscope illumination system. The field diaphragms include a frame portion configured to be received by the surgical microscope; and a non-circularly symmetric mask portion integrated with the frame portion. The mask portion is aligned such that marginal rays from an edge of the field diaphragm along a meridian of minimum diameter that reflect from a surface of an objective lens of the microscope reflect outside of an acceptance angle for relay through any ocular channel of the microscope.
    Type: Application
    Filed: November 9, 2015
    Publication date: May 11, 2017
    Inventors: Christopher Saxer, Al-Hafeez Z. Dhalla, Robert H. Hart, Eric L. Buckland
  • Publication number: 20160298953
    Abstract: An optical coherence tomography (OCT) system including a source of broadband optical radiation and a beamsplitter coupled to the source is provided. The beamsplitter divides the source radiation into a reference path and a sample path. The reference path includes an optical switch to switch the reference path between a first path having a first reference reflection at a first reference optical path length and a second path having a second reference reflection at a second reference optical path length. The system further includes a beam combiner that mixes source radiation reflected from a subject in the sample path with source radiation returned from the first reference reflection and the second reference reflection. A detection system detects a first wavelength dependent interferogram during the first time interval and a second wavelength dependent interferogram during the second time interval. A processor preconditions the first and second wavelength dependent interferograms.
    Type: Application
    Filed: June 23, 2016
    Publication date: October 13, 2016
    Inventors: Eric L. Buckland, Al-Hafeez Z. Dhalla, Nestor O. Farmiga, Mehran Ghofrani, Robert H. Hart, Andrew Murnan, Christopher Saxer
  • Patent number: 9377291
    Abstract: An optical coherence tomography (OCT) system including a source of broadband optical radiation and a beamsplitter coupled to the source is provided. The beamsplitter divides the source radiation into a reference path and a sample path. The reference path includes an optical switch to switch the reference path between a first path having a first reference reflector at a first reference optical path length and a second path having a second reference reflector at a second reference optical path length, different from the first reference optical path length. The system further includes a beam combiner that mixes source radiation reflected from a subject in the sample path with source radiation returned from the first reference reflector during a first time interval and the second reference reflector during a second time interval. A detection system detects a first wavelength dependent interferogram during the first time interval and a second wavelength dependent interferogram during the second time interval.
    Type: Grant
    Filed: December 5, 2014
    Date of Patent: June 28, 2016
    Assignee: Bioptigen, Inc.
    Inventors: Eric L. Buckland, Al-Hafeez Z. Dhalla, Nestor O. Farmiga, Mehran Ghofrani, Robert H. Hart, Andrew Murnan, Christopher Saxer
  • Publication number: 20150159992
    Abstract: An optical coherence tomography (OCT) system including a source of broadband optical radiation and a beamsplitter coupled to the source is provided. The beamsplitter divides the source radiation into a reference path and a sample path. The reference path includes an optical switch to switch the reference path between a first path having a first reference reflector at a first reference optical path length and a second path having a second reference reflector at a second reference optical path length, different from the first reference optical path length. The system further includes a beam combiner that mixes source radiation reflected from a subject in the sample path with source radiation returned from the first reference reflector during a first time interval and the second reference reflector during a second time interval. A detection system detects a first wavelength dependent interferogram during the first time interval and a second wavelength dependent interferogram during the second time interval.
    Type: Application
    Filed: December 5, 2014
    Publication date: June 11, 2015
    Inventors: Eric L. Buckland, Al-Hafeez Z. Dhalla, Nestor O. Farmiga, Mehran Ghofrani, Robert H. Hart, Andrew Murnan, Christopher Saxer