James E Purvis

US Patent:

7571493, Aug 11, 2009

Filed:

Aug 4, 2005

Appl. No.:

11/197245

Inventors:

James W. Purvis - Albuquerque NM, US
Larry D. Whinery - Albuquerque NM, US
Richard Brazfield - Albuquerque NM, US
Catherine Lawrie - Tijeras NM, US
David Lawrie - Tijeras NM, US
Dale S. Preece - Watkins CO, US

Assignee:

Sandia Corporation - Albuquerque NM

International Classification:

F41H 1/02
F41H 1/00

US Classification:

2 25

Abstract:

A lightweight, armored protective garment for protecting an arm or leg from blast superheated gases, blast overpressure shock, shrapnel, and spall from a explosive device, such as a Rocket Propelled Grenade (RPG) or a roadside Improvised Explosive Device (IED). The garment has a ballistic sleeve made of a ballistic fabric, such as an aramid fiber (e. g. , KEVLAR) cloth, that prevents thermal burns from the blast superheated gases, while providing some protection from fragments. Additionally, the garment has two or more rigid armor inserts that cover the upper and lower arm and protect against high-velocity projectiles, shrapnel and spall. The rigid inserts can be made of multiple plies of a carbon/epoxy composite laminate. The combination of 6 layers of KEVLAR fabric and 28 plies of carbon/epoxy laminate inserts (with the inserts being sandwiched in-between the KEVLAR layers), can meet the level IIIA fragmentation minimum Vrequirements for the US Interceptor Outer Tactical Vest.

US Patent:

56327030, May 27, 1997

Filed:

Aug 4, 1995

Appl. No.:

8/511599

Inventors:

Donald F. Wilkes - Albuquerque NM
James W. Purvis - Albuquerque NM
A. Keith Miller - Albuquerque NM

Assignee:

Sandia Corporation - Albuquerque NM

International Classification:

F16H 926
F16H 3702

US Classification:

475211

Abstract:

An infinitely variable transmission is capable of operating between a maximum speed in one direction and a minimum speed in an opposite direction, including a zero output angular velocity, while being supplied with energy at a constant angular velocity. Input energy is divided between a first power path carrying an orbital set of elements and a second path that includes a variable speed adjustment mechanism. The second power path also connects with the orbital set of elements in such a way as to vary the rate of angular rotation thereof. The combined effects of power from the first and second power paths are combined and delivered to an output element by the orbital element set. The transmission can be designed to operate over a preselected ratio of forward to reverse output speeds.

US Patent:

20210159005, May 27, 2021

Filed:

Aug 6, 2020

Appl. No.:

16/986257

Inventors:

James W. Purvis - Albuquerque NM, US

International Classification:

H01F 7/20
B64G 1/40
H01G 11/32
C22C 19/05

Abstract:

The present invention discloses a pulsed electric field propulsion system for spacecraft. The system includes a capacitor stack comprising an array of supercapacitors. Solid-state electronic circuits generate high time-rate-of-change currents and pulsed electric fields in pulse coils. The pulse coils direct the electric fields onto separated electric charges stored in the capacitor stack. The resulting unidirectional Lorentz Forces thereby generate thrust without reaction mass. Reaction momentum is carried away by Poynting Vector fields in conformity with the currently understood principles of electrodynamics. The design is scalable down to micro-chip sized thrusters.

US Patent:

20190168897, Jun 6, 2019

Filed:

Jan 9, 2019

Appl. No.:

16/243327

Inventors:

James Wayne Purvis - Albuquerque NM, US

International Classification:

B64G 1/40
H01F 7/20
F03H 99/00

Abstract:

The present invention discloses systems and methods for electromagnetic field spacecraft propulsion. The system includes reaction thrust assemblies comprising conductor coils with alternating segments of magnetic field shield assemblies. Unshielded reaction thrust assembly segments are bracketed by field activation coils generating shaped magnetic fields. The action of the magnetic fields on currents in the unshielded coil segments of the reaction thrust assemblies produce unidirectional Lorentz Forces, thereby generating thrust without reaction mass, while reaction momentum is carried away by Poynting Vector fields in conformity with the currently understood principles of electrodynamics.

US Patent:

20170292816, Oct 12, 2017

Filed:

Jun 15, 2017

Appl. No.:

15/624636

Inventors:

James Wayne Purvis - Albuquerque NM, US

International Classification:

F41H 13/00
F41A 21/06
F41A 21/02
F41A 19/59
F41A 35/06
F41H 9/10
F41G 1/35

Abstract:

The present invention discloses a personal protection device for multiple less-lethal ammunition options. The device is comprised of a lightweight carbon-composite forearm sleeve assembly having one or more externally mounted light-weight multi-layer composite barrels of various calibers for dispensing less-lethal ammunition at controlled muzzle velocities. In addition, Picatinny Rail attachment points are provided for mounting external tactical gear. The invention thus provides the user with multiple selectable less-lethal ammunition options in a single device while protecting the operating arm. Internally, the gauntlet contains a pistol grip with an electronic control system for selecting and firing individual less-lethal ammunition.

US Patent:

20170264181, Sep 14, 2017

Filed:

Mar 8, 2016

Appl. No.:

15/064401

Inventors:

James Wayne Purvis - Albuquerque NM, US

International Classification:

H02K 41/02

Abstract:

The present invention discloses systems and methods for electromagnetic spacecraft propulsion or thrust generation without the expulsion of reaction mass. The systems include capacitor assemblies with a switch-controlled conductive discharge path, a means of charging the capacitor assemblies, a means of generating magnetic fields using electromagnetic coils, and a means for periodically shaping the intensity, duration and polarity of magnetic fields from the coils. Thrust is generated through the interaction of the shaped magnetic fields and the segmented current in the conductive discharge path during capacitor discharge.

US Patent:

20160254737, Sep 1, 2016

Filed:

Feb 26, 2015

Appl. No.:

14/632604

Inventors:

James W. Purvis - Albuquerque NM, US

International Classification:

H02K 47/00

Abstract:

The present invention discloses systems and methods for electromagnetic propulsion. The electromagnetic propulsion or thrusting systems include two or more electromagnetic coils, a means for rotating one of the electromagnetic coils, and a means for periodically shaping the intensity. duration and polarity of magnetic fields from the coils. In particular, these systems and methods use the interaction between the angular acceleration components of the electromagnetic field generated by the rotating coil with the geometry of one or more stationary electromagnetic coils to achieve thrust without expelling mass.

US Patent:

20160197543, Jul 7, 2016

Filed:

Jan 7, 2015

Appl. No.:

14/591585

Inventors:

James Wayne Purvis - Albuquerque NM, US

International Classification:

H02K 47/00
F03H 99/00
H02K 11/00

Abstract:

The present invention discloses electromagnetic propulsion systems and methods. The electromagnetic propulsion or thrusting systems include a multi-element capacitor, a means for charging and discharging the capacitor, a means for rotating parts of the capacitor, one or more electromagnetic coils, and a means for periodically shaping the intensity, duration and polarity of magnetic fields from the coils. In particular, these systems and methods use interactions between electromagnetic fields and rotating charged elements of capacitors to achieve thrust without expelling mass and with power requirements several orders of magnitude less than current proposed systems.