Richard D Freeman

6356025, Mar 12, 2002

Oct 3, 2000

09/678646

Richard L. Freeman - Del Mar CA
Robert L. Miller - San Diego CA

Archimedes Technology Group, Inc. - San Diego CA

H01J 724

31511151, 343867, 422906

A device for generating a plasma includes an enclosed chamber and an antenna positioned adjacent the wall of the chamber. A ceramic shield is mounted on the wall, with the antenna located between the wall and the ceramic shield. There is also a barrier that is mounted on the wall with the ceramic shield being between the barrier and the antenna element. An alternating voltage source is provided to energize the antenna element to generate a plasma in the chamber. In operation, the ceramic shield isolates the antenna from the plasma in the chamber, and the barrier prevents the deposition of material components from the plasma on the ceramic shield.

6386374, May 14, 2002

May 17, 2001

09/860161

Robert L. Miller - San Diego CA
Tihiro Ohkawa - La Jolla CA
Richard L. Freeman - Del Mar CA

Archimedes Technology Group, Inc. - San Diego CA

B03C 130

209 39, 2092232, 209224, 209234, 210695, 210748, 210222

A multi-mass filter for separating particles of a multi-species plasma includes a chamber, which defines an axis. A radial electric field is crossed with a magnetic field (EÃB) to move the particles of different mass (M , M and M ) on respective trajectories into respective first, second and third regions. Specifically, particles M are confined in the first region, while both particles M and M are ejected from the first region into the second region and only the particles M are ejected from the second region into the third region.

6398920, Jun 4, 2002

Feb 21, 2001

09/790357

Tihiro Ohkawa - La Jolla CA
Robert L. Miller - San Diego CA
Sergei Putvinski - La Jolla CA
Richard L. Freeman - Del Mar CA

Archimedes Technology Group, Inc. - San Diego CA

B01J 1908

204156, 422186

A filter and a method for separating ions in a partially ionized plasma according to their mass includes a chamber with crossed electric and magnetic fields established therein. A feed, including metal atoms having ionization potentials in a low range, and gas atoms having an ionization potential in a high range, is introduced into the chamber. An electron temperature below the low range is generated to partially ionize the feed by dissociating the metal atoms from the gas atoms, and by ionizing the metal atoms into light and heavy ions according to their mass to charge ratio. The light and heavy ions are then influenced by the crossed electric and magnetic fields to separate the light ions from the heavy ions.

6787044, Sep 7, 2004

Mar 10, 2003

10/385073

Richard L. Freeman - Del Mar CA
Robert L. Miller - San Diego CA
John Gilleland - Rancho Santa Fe CA
Tihiro Ohkawa - La Jolla CA

Archimedes Technology Group, Inc. - San Diego CA

B03C 100

210695, 210748, 210222, 210243, 209 121, 209227, 209722, 96 2, 96 3, 95 28

A material separator includes a chamber and electrode(s) to create a radially oriented electric field in the chamber. Coils are provided to generate a magnetic field in the chamber. The separator further includes a launcher to propagate a high-frequency electromagnetic wave into the chamber to convert the material into a multi-species plasma. With the crossed electric and magnetic fields, low mass ions in the multi-species plasma are placed on small orbit trajectories and exit through the end of the chamber while high mass ions are placed on large orbit trajectories for capture at the wall of the chamber.

20040077916, Apr 22, 2004

Oct 16, 2002

10/272481

John Gilleland - Rancho Santa Fe CA, US
Richard Freeman - Del Mar CA, US
Stephen Agnew - San Diego CA, US

G21F009/00

588/010000

A method and system for increasing the waste loading of vitrified nuclear waste includes a plasma mass filter and a heating apparatus. The plasma mass filter is used first to collect radioactive particles from a multi-species plasma. The radioactive particles are then placed, together with a frit, in crucibles. The crucibles are then induction heated to fuse the radioactive elements with the frit to form a melted mixture which is then cooled to form vitrified waste having relatively high waste loading.

45648077, Jan 14, 1986

Mar 27, 1984

6/593801

Hiroyuki Ikezi - San Diego CA
Richard L. Freeman - Del Mar CA

GA Technologies Inc. - San Diego CA

G01R 3126

324158D

A method for judging whether a group of semiconductor devices have sufficiently short carrier lifetimes to make them suitable for use in high speed electronic circuitry. A determination is made as to the satisfactory carrier lifetime for a pn junction in the devices. A capacitance value representative of the pn junction, when reverse biased, is also determined. The pn junction is placed in series with an inductor sized so that the resonant frequency of the inductor and the pn junction, when reversely biased, is substantially equal to the reciprocal of the carrier lifetime. An oscillating voltage is applied to the series combination of the junction and the inductor, the voltage having a fundamental frequency near but above the resonant frequency and an amplitude greater than a predetermined level which is in the range of 3-5 volts. Finally, the device under test is rejected should an output taken across the pn junction show a substantial frequency component below the fundamental frequency.

62934066, Sep 25, 2001

Aug 21, 2000

9/643204

Robert L. Miller - San Diego CA
Tihiro Ohkawa - La Jolla CA
Richard L. Freeman - Del Mar CA

Archimedes Technology Group, Inc. - San Diego CA

B03C 130

209 39

A multi-mass filter for separating particles according to their mass-charge ratio includes a chamber for receiving a multi-species plasma that includes particles therein having different mass-charge ratios (with M. sub. 1

63040360, Oct 16, 2001

Aug 8, 2000

9/634926

Richard L. Freeman - Del Mar CA
Robert L. Miller - San Diego CA

Archimedes Technology Group, Inc. - San Diego CA

H05H 146

31511151

A system and method for initiating and maintaining a plasma in a chamber, in accordance with the helicon dispersion relation, requires an antenna for radiating RF energy into the chamber. An interferometer, or some similar device, is used in the system to monitor the plasma density level in the chamber, as the plasma is being produced. The plasma density level is then used to control the variable characteristics of the RF energy in accordance with the helicon dispersion relation.