Patents by Inventor Marcus L. Caldwell

Marcus L. Caldwell 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: 11604053
    Abstract: A digitally controlled hand-tossable explosive delivery receptacle comprises a ruggedized reusable compartment enclosing a digital circuit and a disposable cartridge holding one or more explosive chemical agents and a primer. The disposable cartridge is configured to be mounted to the ruggedized reusable cartridge, and a high-strength bulkhead incorporated into the reusable or disposable compartment that separates the digital circuit from the chemical agents. The reusable compartment is sufficiently ruggedized to withstand the ignition of the primer and the detonation of the chemical agents to be reused with one or more additional disposable cartridges. In one implementation, the delivery receptacle uses a commercial airbag initiator as the primer, which is arranged in relation to the one or more chemical agents so that when the initiator is activated, it generates a pressure wave that expels the one or more chemical agents from the grenade.
    Type: Grant
    Filed: May 2, 2022
    Date of Patent: March 14, 2023
    Assignee: Liberty Dynamic, LLC
    Inventor: Marcus L. Caldwell
  • Publication number: 20220390215
    Abstract: A digitally controlled hand-tossable explosive delivery receptacle comprises a ruggedized reusable compartment enclosing a digital circuit and a disposable cartridge holding one or more explosive chemical agents and a primer. The disposable cartridge is configured to be mounted to the ruggedized reusable cartridge, and a high-strength bulkhead incorporated into the reusable or disposable compartment that separates the digital circuit from the chemical agents. The reusable compartment is sufficiently ruggedized to withstand the ignition of the primer and the detonation of the chemical agents to be reused with one or more additional disposable cartridges. In one implementation, the delivery receptacle uses a commercial airbag initiator as the primer, which is arranged in relation to the one or more chemical agents so that when the initiator is activated, it generates a pressure wave that expels the one or more chemical agents from the grenade.
    Type: Application
    Filed: May 2, 2022
    Publication date: December 8, 2022
    Inventor: Marcus L. Caldwell
  • Patent number: 11320248
    Abstract: A digitally controlled hand-tossable explosive delivery receptacle comprises a ruggedized reusable compartment enclosing a digital circuit and a disposable cartridge holding one or more explosive chemical agents and a primer. The disposable cartridge is configured to be mounted to the ruggedized reusable cartridge, and a high-strength bulkhead incorporated into the reusable or disposable compartment that separates the digital circuit from the chemical agents. The reusable compartment is sufficiently ruggedized to withstand the ignition of the primer and the detonation of the chemical agents to be reused with one or more additional disposable cartridges. In one implementation, the delivery receptacle uses a commercial airbag initiator as the primer, which is arranged in relation to the one or more chemical agents so that when the initiator is activated, it generates a pressure wave that expels the one or more chemical agents from the grenade.
    Type: Grant
    Filed: December 3, 2020
    Date of Patent: May 3, 2022
    Assignee: Liberty Dynamic, LLC
    Inventor: Marcus L. Caldwell
  • Patent number: 11307007
    Abstract: A digitally controlled hand-tossable explosive delivery receptacle comprises a ruggedized reusable compartment enclosing a digital circuit and a disposable cartridge holding one or more explosive chemical agents and a primer. The disposable cartridge is configured to be mounted to the ruggedized reusable cartridge, and a high-strength bulkhead incorporated into the reusable or disposable compartment that separates the digital circuit from the chemical agents. The reusable compartment is sufficiently ruggedized to withstand the ignition of the primer and the detonation of the chemical agents to be reused with one or more additional disposable cartridges. In one implementation, the delivery receptacle uses a commercial airbag initiator as the primer, which is arranged in relation to the one or more chemical agents so that when the initiator is activated, it generates a pressure wave that expels the one or more chemical agents from the grenade.
    Type: Grant
    Filed: December 3, 2020
    Date of Patent: April 19, 2022
    Assignee: Liberty Dynamic, LLC
    Inventor: Marcus L. Caldwell
  • Publication number: 20220099419
    Abstract: A digitally controlled hand-tossable explosive delivery receptacle comprises a ruggedized reusable compartment enclosing a digital circuit and a disposable cartridge holding one or more explosive chemical agents and a primer. The disposable cartridge is configured to be mounted to the ruggedized reusable cartridge, and a high-strength bulkhead incorporated into the reusable or disposable compartment that separates the digital circuit from the chemical agents. The reusable compartment is sufficiently ruggedized to withstand the ignition of the primer and the detonation of the chemical agents to be reused with one or more additional disposable cartridges. In one implementation, the delivery receptacle uses a commercial airbag initiator as the primer, which is arranged in relation to the one or more chemical agents so that when the initiator is activated, it generates a pressure wave that expels the one or more chemical agents from the grenade.
    Type: Application
    Filed: June 3, 2021
    Publication date: March 31, 2022
    Inventor: Marcus L. Caldwell
  • Patent number: 11243057
    Abstract: A digitally controlled hand-tossable explosive delivery receptacle comprises a ruggedized reusable compartment enclosing a digital circuit and a disposable cartridge holding one or more explosive chemical agents and a primer. The disposable cartridge is configured to be mounted to the ruggedized reusable cartridge, and a high-strength bulkhead incorporated into the reusable or disposable compartment that separates the digital circuit from the chemical agents. The reusable compartment is sufficiently ruggedized to withstand the ignition of the primer and the detonation of the chemical agents to be reused with one or more additional disposable cartridges. In one implementation, the delivery receptacle uses a commercial airbag initiator as the primer, which is arranged in relation to the one or more chemical agents so that when the initiator is activated, it generates a pressure wave that expels the one or more chemical agents from the grenade.
    Type: Grant
    Filed: June 14, 2019
    Date of Patent: February 8, 2022
    Assignee: Liberty Dynamic, LLC
    Inventor: Marcus L. Caldwell
  • Publication number: 20210341274
    Abstract: A digitally controlled hand-tossable explosive delivery receptacle comprises a ruggedized reusable compartment enclosing a digital circuit and a disposable cartridge holding one or more explosive chemical agents and a primer. The disposable cartridge is configured to be mounted to the ruggedized reusable cartridge, and a high-strength bulkhead incorporated into the reusable or disposable compartment that separates the digital circuit from the chemical agents. The reusable compartment is sufficiently ruggedized to withstand the ignition of the primer and the detonation of the chemical agents to be reused with one or more additional disposable cartridges. In one implementation, the delivery receptacle uses a commercial airbag initiator as the primer, which is arranged in relation to the one or more chemical agents so that when the initiator is activated, it generates a pressure wave that expels the one or more chemical agents from the grenade.
    Type: Application
    Filed: December 3, 2020
    Publication date: November 4, 2021
    Inventor: Marcus L. Caldwell
  • Publication number: 20210180928
    Abstract: A digitally controlled hand-tossable explosive delivery receptacle comprises a ruggedized reusable compartment enclosing a digital circuit and a disposable cartridge holding one or more explosive chemical agents and a primer. The disposable cartridge is configured to be mounted to the ruggedized reusable cartridge, and a high-strength bulkhead incorporated into the reusable or disposable compartment that separates the digital circuit from the chemical agents. The reusable compartment is sufficiently ruggedized to withstand the ignition of the primer and the detonation of the chemical agents to be reused with one or more additional disposable cartridges. In one implementation, the delivery receptacle uses a commercial airbag initiator as the primer, which is arranged in relation to the one or more chemical agents so that when the initiator is activated, it generates a pressure wave that expels the one or more chemical agents from the grenade.
    Type: Application
    Filed: December 3, 2020
    Publication date: June 17, 2021
    Inventor: Marcus L. Caldwell
  • Publication number: 20210116223
    Abstract: A flashbang grenade is mounted on a mobile carrier having motor-driven wheels for navigating. The flashbang grenade has a first fuel-loaded chamber and a second oxidizer-loaded chamber housed within one or two receptacles. Applying current to a squib triggers a pressure wave to expel the fuel and oxidizer from the first and second chambers, which is then detonated. In operation, the flashbang grenade is attached to the mobile carrier, carried to a location of a disturbance, tossed into a crowd, navigated to an optimal spot, and discharged. A controller operates both the hand-tossable mobile carrier and the flashbang grenade. It provides a joystick or equivalent to navigate the mobile carrier and a button (or two buttons that have to be pressed at the same time) to discharge the flashbang grenade. A display shows video collected from the mobile carrier, assisting the operator in navigating the mobile carrier.
    Type: Application
    Filed: August 12, 2020
    Publication date: April 22, 2021
    Inventor: Marcus L. Caldwell
  • Publication number: 20200333119
    Abstract: A digitally controlled hand-tossable explosive delivery receptacle comprises a ruggedized reusable compartment enclosing a digital circuit and a disposable cartridge holding one or more explosive chemical agents and a primer. The disposable cartridge is configured to be mounted to the ruggedized reusable cartridge, and a high-strength bulkhead incorporated into the reusable or disposable compartment that separates the digital circuit from the chemical agents. The reusable compartment is sufficiently ruggedized to withstand the ignition of the primer and the detonation of the chemical agents to be reused with one or more additional disposable cartridges. In one implementation, the delivery receptacle uses a commercial airbag initiator as the primer, which is arranged in relation to the one or more chemical agents so that when the initiator is activated, it generates a pressure wave that expels the one or more chemical agents from the grenade.
    Type: Application
    Filed: June 14, 2019
    Publication date: October 22, 2020
    Inventor: Marcus L. Caldwell
  • Patent number: 7845280
    Abstract: A diversionary device has a housing having dimensions which are selected such that when the device is thrown or dropped, the device will come to rest only on one of its two primary sides. Each primary side has a circular dispersion port formed therethrough. The device includes means for blocking the first dispersion port if the device comes to rest on the first primary surface and for blocking the second dispersion port if the device comes to rest on the second primary surface. A firing mechanism is operable to discharge an ignitable composition out of a removable cartridge within the housing. The ignitable composition is discharged through the first dispersion port when the device rests on the second primary side and through the second dispersion port when the device rests on the first primary side. The composition then forms a cloud above the device and may be ignited.
    Type: Grant
    Filed: November 11, 2008
    Date of Patent: December 7, 2010
    Assignee: Law Enforcement Technologies, Inc.
    Inventor: Marcus L. Caldwell
  • Publication number: 20100282108
    Abstract: A replaceable cartridge is provided for insertion into a diversionary device. The cartridge includes a housing with a first chamber containing an ignitable composition. A breakable seal covers a first end of the first chamber. The cartridge also includes a piston within the housing and having a first position at a second end of the first chamber. The piston is movable towards the second end of the first chamber whereby, when a trigger for the diversionary device is activated, the piston moves towards the first end of the first chamber to discharge the ignitable composition through the breakable seal for subsequent ignition outside of the diversionary device.
    Type: Application
    Filed: November 11, 2008
    Publication date: November 11, 2010
    Inventor: Marcus L. Caldwell
  • Publication number: 20100282109
    Abstract: A firing mechanism for a diversionary device is provided includes a firing pin movable along a first axis and a hammer in contact with a first end of the firing pin and operable to move the firing pin from a cocked position to a fired position. A rotary solenoid has a shaft rotatable about a second axis parallel; a cam is mounted on a first end of the shaft. A trip lever with a cam follower engaged with the cam is slidable in a direction substantially orthogonal to the first and second axes from first to second positions. The mechanism further includes a link arm connecting the trip lever to the firing pin. When the rotary solenoid is activated, the cam causes the trip lever to slide from the first to the second position and release the firing pin to move from the cocked position to the fired position.
    Type: Application
    Filed: November 11, 2008
    Publication date: November 11, 2010
    Inventor: Marcus L. Caldwell
  • Publication number: 20100275803
    Abstract: A diversionary device has a housing having dimensions which are selected such that when the device is thrown or dropped, the device will come to rest only on one of its two primary sides. Each primary side has a circular dispersion port formed therethrough. The device includes means for blocking the first dispersion port if the device comes to rest on the first primary surface and for blocking the second dispersion port if the device comes to rest on the second primary surface. A firing mechanism is operable to discharge an ignitable composition out of a removable cartridge within the housing. The ignitable composition is discharged through the first dispersion port when the device rests on the second primary side and through the second dispersion port when the device rests on the first primary side. The composition then forms a cloud above the device and may be ignited.
    Type: Application
    Filed: November 11, 2008
    Publication date: November 4, 2010
    Inventor: Marcus L. Caldwell
  • Patent number: 6427675
    Abstract: An improved ball pitching apparatus for a ball pitching machine of the type having an upper and lower wheel, said wheels rotating on substantially parallel shafts and having generally aligned and spaced rims carrying peripheral ball gripping bands; independent speed controlled drive motors; a ball feeder for feeding the ball between the spaced rims so that the ball will be gripped and accelerated in a trajectory tangential to the rims; a head frame carrying the wheels, drive motors, and ball feeder; and, a stand carrying the head frame.
    Type: Grant
    Filed: August 22, 2000
    Date of Patent: August 6, 2002
    Inventors: Marcus L. Caldwell, Frederick L. Caldwell
  • Patent number: 6401704
    Abstract: An improved ball pitching apparatus for a ball pitching machine of the type having an upper and lower wheel, said wheels rotating on substantially parallel shafts and having generally aligned and spaced rims carrying peripheral ball gripping bands; independent speed controlled drive motors; a ball feeder for feeding the ball between the spaced rims so that the ball will be gripped and accelerated in a trajectory tangential to the rims; a head frame carrying the wheels, drive motors, and ball feeder; and, a stand carrying the head frame.
    Type: Grant
    Filed: August 27, 2001
    Date of Patent: June 11, 2002
    Inventor: Marcus L. Caldwell
  • Publication number: 20020023633
    Abstract: An improved ball pitching apparatus for a ball pitching machine of the type having an upper and lower wheel, said wheels rotating on substantially parallel shafts and having generally aligned and spaced rims carrying peripheral ball gripping bands; independent speed controlled drive motors; a ball feeder for feeding the ball between the spaced rims so that the ball will be gripped and accelerated in a trajectory tangential to the rims; a head frame carrying the wheels, drive motors, and ball feeder; and, a stand carrying the head frame.
    Type: Application
    Filed: August 27, 2001
    Publication date: February 28, 2002
    Inventor: Marcus L. Caldwell
  • Publication number: 20020023634
    Abstract: An improved ball pitching apparatus for a ball pitching machine of the type having an upper and lower wheel, said wheels rotating on substantially parallel shafts and having generally aligned and spaced rims carrying peripheral ball gripping bands; independent speed controlled drive motors; a ball feeder for feeding the ball between the spaced rims so that the ball will be gripped and accelerated in a trajectory tangential to the rims; a head frame carrying the wheels, drive motors, and ball feeder; and, a stand carrying the head frame.
    Type: Application
    Filed: August 27, 2001
    Publication date: February 28, 2002
    Inventor: Marcus L. Caldwell
  • Patent number: 5189660
    Abstract: A moving coil, linear positioning transducer actuator suitable for optical recording and playback devices is constructed by forming the actuator frame, magnetic pole pieces and the magnetic core of the moving coil from a single piece of ferrous material and wherein the path of the moving coil and transducer are substantially collinear. The transducer is supported by parallel rails which are mounted to the frame.
    Type: Grant
    Filed: May 9, 1991
    Date of Patent: February 23, 1993
    Assignee: Tandy Corporation
    Inventor: Marcus L. Caldwell
  • Patent number: 5117414
    Abstract: A disk drive motor and spindle assembly includes a drive motor having a drive shaft defining an axis of rotation, a centering hub, and a flat spiral spring. The centering hub has a spherical disk-receiving surface section about a sphere center and a cavity extending therein from its lower edge. The spiral spring mounts the centering hub with respect to the drive shaft with the sphere center located on the axis of rotation and in the plane of the spring.
    Type: Grant
    Filed: September 19, 1988
    Date of Patent: May 26, 1992
    Assignee: Hewlett-Packard Company
    Inventor: Marcus L. Caldwell