Vivek R Dave, 5714 Hayward Brook Dr, Concord, NH 03301

8372224, Feb 12, 2013

Mar 12, 2010

12/722537

Vivek R Dave - Los Alamos NM, US
Mark J Cola - Santa Fe NM, US
Robert E Swanson - Albuquerque NM, US
Daniel Hartman - Santa Fe NM, US

B6 Sigma, Inc. - Santa Fe NM

C06B 45/00
C06B 45/12
C06B 45/04
D03D 23/00
D03D 43/00

1491096, 149 2, 149 14, 149 17, 1491094

The present inventions provide methods of manufacturing methods for case metallic materials for munitions that have high enthalpic energy release and controlled fragmentation and breakup enabling fragment speeds up to twice what is otherwise possible in explosively driven metal systems, and munitions made by such methods. Embodiments of the invention involve the thixotropic processing of energetic materials such as aluminum together with high density materials such as tantalum or tungsten to achieve material microstructures with a bulk density equivalent to steel, but with the energy release potential of materials such as finely dispersed aluminum powders. Such methods of mixing and blending of high energy and high density materials can provide a microstructure that has large density and shock impedance differences over length scales of 10-100 microns, resulting in enhanced materials fragmentation in the shock or brisant loading regime, incipient melting at the lower melting point constituents, and additional enhancement of fragmentation in the gas-dynamic expansion phase of munitions breakup. Additionally, the present inventions provide a range of surface and near-surface processing methods to enhance spall and ejecta from conventional munitions systems, enhancing munition breakup and reactivity as well.

2002013, Oct 3, 2002

Feb 1, 2001

09/776045

John Milewski - Santa Fe NM, US
Vivek Dave - Los Alamos NM, US
Dane Christensen - Livermore CA, US
Robert Carpenter - Santa Fe NM, US

B23K026/20

219/121600, 700/166000, 700/114000, 700/029000

There has been invented a method and apparatus for heat treating or brazing joints in metals and ceramics using an optical concentrator (reflecting waveguide) to reflect energy from infrared energy heat sources, in a pattern which will provide precisely tailored illumination, heating, melting of filler and fusion of the area to be heat treated or the joint to be formed. CAD optical ray tracing software is used to custom design the reflecting waveguides for directing the energy as needed. With the invention, shorter, reduced energy heat cycles can be used to produce reliable accurate brazes, including brazes to join small diameter tubes. No furnace is necessary because localized small area brazing can be done in situ with the invention method and apparatus. Various heat sources can be used to braze various geometries, including very small diameter tubes.

2007016, Jul 19, 2007

Apr 19, 2006

11/379378

Vivek Dave - Santa Fe NM, US
Mark Cola - Santa Fe NM, US
Daniel Hartman - Santa Fe NM, US
C. Kline - Santa Fe NM, US
Joel House - Eglin AFB FL, US
Geremy Kleiser - Niceville FL, US

F42B 30/00

102517000

A projectile formed from dissimilar materials. The projectile includes a metallurgical interlayer that joins the dissimilar materials together. The metallurgical interlayer also matches the shock impedance of the two materials to prevent delamination during launch and during impact.

2010028, Nov 18, 2010

May 14, 2010

12/780610

Vivek R. Dave - Los Alamos NM, US
Mark J. Cola - Santa Fe NM, US

B23K 9/18
B23K 26/00
B23K 9/16
B23K 9/04
B23K 15/00

219 732, 21912164, 219 74, 219 761, 21912114, 219 73

A new method of process control for fusion welding maintains a controlled weld pool size or volume, for example in some applications a substantially constant weld pool size or volume. The invention comprises a method of linking machine and process variables to the weld pool size or volume in real time, thereby enabling constant weld pool volume control. The invention further comprises a method of using thermal inverse models to rapidly process real-time data and enable models-based control of welding processes so as to implement constant weld pool volume control.

2013012, May 23, 2013

Jan 2, 2013

13/733002

Vivek R. Dave - Los Alamos NM, US
Mark J. Cola - Santa Fe NM, US

B23K 31/00

219 761, 21912114, 21912164, 219148

A new method of process control for fusion welding maintains a controlled weld pool size or volume, for example in some applications a substantially constant weld pool size or volume. The invention comprises a method of linking machine and process variables to the weld pool size or volume in real time, thereby enabling constant weld pool volume control. The invention further comprises a method of using thermal inverse models to rapidly process real-time data and enable models-based control of welding processes so as to implement constant weld pool volume control.

2022038, Dec 8, 2022

Jun 14, 2022

17/839853

- Santa Fe NM, US
Lars Jacquemetton - Santa Fe NM, US
Glenn Wikle - Santa Fe NM, US
Mark J. Cola - Santa Fe NM, US
Vivek R. Dave - Concord NH, US
Darren Beckett - Corrales NM, US
Alberto M. Castro - Santa Fe NM, US

Sigma Labs, Inc. - Santa Fe NM

B29C 64/393
B33Y 10/00
B33Y 50/00
B33Y 50/02
B23K 26/342
B23K 26/70
B23K 15/00
B23K 26/03
B23K 31/12
B22F 10/20

This disclosure describes various methods and apparatus for characterizing an additive manufacturing process. A method for characterizing the additive manufacturing process can include generating scans of an energy source across a build plane; measuring an amount of energy radiated from the build plane during each of the scans using an optical sensor; determining an area of the build plane traversed during the scans; determining a thermal energy density for the area of the build plane traversed by the scans based upon the amount of energy radiated and the area of the build plane traversed by the scans; mapping the thermal energy density to one or more location of the build plane; determining that the thermal energy density is characterized by a density outside a range of density values; and thereafter, adjusting subsequent scans of the energy source across or proximate the one or more locations of the build plane.

2022032, Oct 13, 2022

Jun 22, 2022

17/847038

- Santa Fe NM, US
Scott Betts - Albuquerque NM, US
Martin Piltch - Los Alamos NM, US
R. Bruce Madigan - Butte MT, US
Lars Jacquemetton - Santa Fe NM, US
Glenn Wikle - Santa Fe NM, US
Mark J. Cola - Santa Fe NM, US
Vivek R. Dave - Concord NH, US
Alberto M. Castro - Santa Fe NM, US
Roger Frye - Santa Fe NM, US

Sigma Labs, Inc. - Santa Fe NM

B23K 26/34
B33Y 10/00
B23K 26/354
B23K 15/00
B33Y 50/02
B23K 26/342
B23K 26/03
B23K 26/082
B29C 64/153
B23K 31/12
B23K 26/06

This disclosure describes various methods and apparatus for characterizing an additive manufacturing process. A method for characterizing the additive manufacturing process can include generating scans of an energy source across a build plane; measuring an amount of energy radiated from the build plane during each of the scans using an optical sensing system that monitors two discrete wavelengths associated with a blackbody radiation curve of the layer of powder; determining temperature variations for an area of the build plane traversed by the scans based upon a ratio of sensor readings taken at the two discrete wavelengths; determining that the temperature variations are outside a threshold range of values; and thereafter, adjusting subsequent scans of the energy source across or proximate the area of the build plane.

2023012, Apr 27, 2023

Aug 25, 2022

17/895904

- Santa Fe NM, US
Vivek R. Dave - Concord NH, US
Mark J. Cola
Glenn Wikle - Santa Fe NM, US
R. Bruce Madigan - Butte MT, US

SIGMA ADDITIVE SOLUTIONS, INC. - Santa Fe NM

B23K 31/12
B33Y 30/00
B22F 10/28
B22F 12/90
B22F 10/366
B22F 10/368
B23K 26/342

This disclosure describes an additive manufacturing method that includes monitoring a temperature of a portion of a build plane during an additive manufacturing operation using a temperature sensor as a heat source passes through the portion of the build plane; detecting a peak temperature associated with one or more passes of the heat source through the portion of the build plane; determining a threshold temperature by reducing the peak temperature by a predetermined amount; identifying a time interval during which the monitored temperature exceeds the threshold temperature; identifying, using the time interval, a change in manufacturing conditions likely to result in a manufacturing defect; and changing a process parameter of the heat source in response to the change in manufacturing conditions.