Patents by Inventor Charles F. Stevens

Charles F. Stevens 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).

  • Publication number: 20190171665
    Abstract: Image similarity searching can be achieved by improving utilization of computing resources so that computing power can be reduced while maintaining accuracy or accuracy can be improved using a same level of computing power. Such a similarity search can be achieved via an expansion matrix that expands the number of dimensions in an input feature vector of a query image. Dimensionality of an input feature vector can be increased, resulting in a higher dimensional hash. Sparsification can then be applied to the resulting higher dimensional hash. Sparsification can use a winner-take-all technique or setting a threshold, resulting in a hash of reduced length, but can still be considered of the expanded dimensionality. Matching the query image against a corpus of sample images can be achieved via nearest neighbor techniques via the resulting hashes to find sample images matching the query image.
    Type: Application
    Filed: December 5, 2018
    Publication date: June 6, 2019
    Applicant: Salk Institute for Biological Studies
    Inventors: Saket Navlakha, Charles F. Stevens
  • Patent number: 8634923
    Abstract: An apparatus includes: an input configured to receive information indicative of sensed light locations; memory coupled to the input and storing indicia of receptive fields forming a mosaic, each of the receptive fields corresponding to an electrode, the mosaic including first and receptive fields having first and second shapes that are different, the memory further storing instructions; a processor coupled to the input and the memory and configured to read and execute the instructions to: analyze the information indicative of sensed light locations; determine, for each of respective ones of the sensed light locations, one or more receptive fields that include the corresponding sensed light location; and produce excitation indicia; the apparatus further including an output coupled to the processor and configured to be coupled to a retinal implant and to convey the excitation indicia toward the retinal implant.
    Type: Grant
    Filed: August 25, 2010
    Date of Patent: January 21, 2014
    Assignee: Salk Institute for Biological Studies
    Inventors: Tatyana O. Sharpee, Charles F. Stevens
  • Publication number: 20120221076
    Abstract: An apparatus includes: an input configured to receive information indicative of sensed light locations; memory coupled to the input and storing indicia of receptive fields forming a mosaic, each of the receptive fields corresponding to an electrode, the mosaic including first and receptive fields having first and second shapes that are different, the memory further storing instructions; a processor coupled to the input and the memory and configured to read and execute the instructions to: analyze the information indicative of sensed light locations; determine, for each of respective ones of the sensed light locations, one or more receptive fields that include the corresponding sensed light location; and produce excitation indicia; the apparatus further including an output coupled to the processor and configured to be coupled to a retinal implant and to convey the excitation indicia toward the retinal implant.
    Type: Application
    Filed: August 25, 2010
    Publication date: August 30, 2012
    Applicant: THE SALK INSTITUTE FOR BIOLOGICAL STUDIES
    Inventors: Tatyana O. Sharpee, Charles F. Stevens
  • Patent number: 6401377
    Abstract: A resettable trigger mechanism has an activating rod with a first portion slidably mounted in a housing and a second portion extending from the housing. The activating rod has a notch formed in its first portion. A trigger is coupled to the activating rod's second portion. A first spring coupled between the activating rod and housing biases the second portion towards the housing. A reset rod has a first section slidably mounted in the housing and a second section extending from the housing. The reset rod has a cutout portion formed in its first section for slidingly receiving therethrough the first portion of the activating rod. A second spring is coupled between the reset rod and housing for biasing the second section away from the housing. When the trigger is activated, the activating rod is pulled from the housing to align its notch with the cutout portion of the reset rod so that the reset rod can move under the force of the second spring until the reset rod's cutout portion engages the notch.
    Type: Grant
    Filed: May 24, 2001
    Date of Patent: June 11, 2002
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Vincent J. Vendetti, Michael M. Canaday, Charles F. Stevens
  • Patent number: 6338219
    Abstract: An optical sight is integrated into a bracket that can support an optical scope. The bracket defines a bore therethrough such that an optical line-of-sight is defined that is parallel to the line-of-sight of the optical scope. A post extends vertically upward into the bore at a forward end of the bracket in a way that the post's outboard end can be selectively positioned in the bore along a vertical line extending through the bore. A plate with a viewing aperture formed therethrough is mounted across the bore at an aft end of the bracket in a way that the viewing aperture can be selectively positioned along a horizontal line that is perpendicular to the vertical line defined by the post.
    Type: Grant
    Filed: June 8, 2000
    Date of Patent: January 15, 2002
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Fred W. Watson, Jr., Charles F. Stevens, Vincent J. Vendetti, Michael M. Canaday
  • Patent number: 5086524
    Abstract: An actuator tube slidably embraces the overflow tube on a toilet tank and has an actuator flange at the lower end thereof. An actuator sleeve slidably embraces the actuator tube with stops limiting the relative sliding distance. An actuator surface is also mounted on the sleeve so that, when the flapper valve at the bottom of the toilet tank is raised to release flush water, the float descends and with it descend the actuator tube and flange, as well as sleeve and actuating surface. The flange thrusts the flapper valve partway down, and the actuating surface sliding down the tube finally closes the flapper valve before all toilet tank water is released to thereby conserve water.
    Type: Grant
    Filed: March 25, 1991
    Date of Patent: February 11, 1992
    Inventor: Charles F. Stevens
  • Patent number: 5056544
    Abstract: The recreational vehicle has a valve which is remotely controlled to permit remote draining of the drain water tank. The method of flushing the tank, including remote control of the drain valves is also included.
    Type: Grant
    Filed: January 16, 1990
    Date of Patent: October 15, 1991
    Inventor: Charles F. Stevens
  • Patent number: 5040247
    Abstract: A float has a bore which slidably embraces the overflow tube in a toilet tank. The float carries a valve actuator therebelow with structure which permits adjustment of the downward position of the valve actuator. The float and/or valve actuator may be non-round in order to fit closely adjacent the wall of the toilet tank. When the flapper valve at the bottom of the toilet tank is raised to release flush water, the float descends with lowering water leve and the actuator closes the flapper valve before all toilet tank water is released, to thereby conserve water.
    Type: Grant
    Filed: May 4, 1990
    Date of Patent: August 20, 1991
    Assignee: Mini-Flush Corporation
    Inventor: Charles F. Stevens
  • Patent number: 4937895
    Abstract: A float has a bore which slidably embraces the overflow tube in a toilet tank. The float carries a valve actuator therebelow with structure which permits adjustment of the downward position of the valve actuator. The float and/or valve actuator may be non-round in order to fit closely adjacent the wall of the toilet tank. When the flapper valve at the bottom of the toilet tank is raised to release flush water, the float descends with lowering water level and the actuator closes the flapper valve before all toilet tank water is released, to thereby conserve water.
    Type: Grant
    Filed: May 2, 1988
    Date of Patent: July 3, 1990
    Inventor: Charles F. Stevens
  • Patent number: 4903716
    Abstract: The recreational vehicle tank flushing system has associated with each water tank on the recreational vehicle a way of providing multiple rinses and sanitizing material into each of the potable water tank, gray water tank and black water tank.
    Type: Grant
    Filed: December 18, 1987
    Date of Patent: February 27, 1990
    Inventor: Charles F. Stevens
  • Patent number: 4748699
    Abstract: A float is slidably mounted on the upright overflow tube or other upright guide in the toilet tank. As the water level lowers during flushing, the float descends so that a valve actuator on the bottom of the float closes the flapper valve when the water level is partway down the tank, to conserve flush water.When it is desired that the user have a choice between a limited flush for the flushing of liquids and a full flush, a hook is provided so that it can be manipulated to engage the float to hold the float in its raised, non-actuating position. By manipulation of the flush handle, the hook on the flush lever can be moved between the float-engaging and the float non-engaging position.
    Type: Grant
    Filed: May 15, 1987
    Date of Patent: June 7, 1988
    Inventor: Charles F. Stevens