Field of Invention :
The present invention relates to methods and apparatus which use capacitors charged to high potentials for generating thrust and, more particularly, to an improved apparatus using a two dimensional, asymmetrical capacitor to which a high potential is applied.
...
Although the asymmetrical capacitor module described in the preceding paragraph has worked well in the laboratory, one potential disadvantage or limitation thereof is that there is some tendency to arcing between potential surfaces. More generally, there is a need to further improve the module construction to enable use thereof for atmospheric propulsion and for propulsion in space.

The NASA PATENT: US2002012221 granted on January 31, 2002

Apparatus for generating thrust using a two dimensional, asymmetrical capacitor module
Patent Number: US2002012221
Publication date:   2002-01-31
Inventor(s):    CAMPBELL JONATHAN W (US)
Applicant(s):  US OF AMERICA NASA (US)

Abstract : An asymmetrical capacitor module for generating thrust includes two conductive elements of similar but different geometries separated by a dielectric member. Improved embodiments provided in the construction of conductive elements of smaller axial extent include those where the element is formed by an annular wire or a dielectric supported ring. Other embodiments concern the dielectric member and involve changes in the extent and shape thereof. 

At page 2 chapter [0034] <<Referring to the Fig 1.... a cylinder 12 made of copper or another highly conductive material. >>
At page 3 chapter [0037] : << In this embodiment disk 14 is replaced by a ring or annulus preferably in form of a fine wire 24 made of copper or another highly conductive material. >>

See the tests of the NASA Orbital Maneuvering Propellantless Truster v1.0
A standard reply from the NASA about the Asymmetrical Capacitors (ACs), Lifters and Biefeld-Brown devices.. ( 06-07-02 )

Read the NASA Patent description and see the FULL NASA PATENT US 6,317,310 ( granted November 13, 2001 )
NASA MFS 31419_1 - Apparatus & Method for Generating Thrust Using a Two Dimensional, Asymmetrical Capacitor; - see the photo of the apparatus tested in vacuum by Transdimensional Technologies

AIAA-2002-1131 - “OUTSIDE THE BOX” SPACE AND TERRESTRIAL TRANSPORTATION AND ENERGY TECHNOLOGIES FOR THE 21ST CENTURY
by Theodore C. Loder. Published by the American Institute of Aeronautics and Astronautics and presented at the 40th AIAA Aerospace Sciences Meeting and Exhibit, Reno NV. Paper number AIAA-2002-1131.

Abstract :
<< This paper reviews the development of antigravity research in the US and notes how research activity seemed to disappear by the mid 1950s. It then addresses recently reported scientific findings and witness testimonies - that show us that this research and technology is alive and well and very advanced. The revelations of findings in this area will alter dramatically our 20th century view of physics and technology and must be considered in planning for both energy and transportation needs in the 21st century.>>

This paper can be downloaded at : http://users.erols.com/iri/Loder.PDF

LORENTZ FORCE PROPULSION SYSTEM

Patent Number: WO02073218
Publication date: September 19th, 2002
Inventor(s): CAMERON JEFFERY A (US)
Applicant(s): TRANSDIMENSIONAL TECHNOLOGIES (US)

Abstract
A plurality of asymmetrical capacitors that develop power in a propulsion system are disclosed. In one embodiment, the capacitor is constructed so as to have an elongated rear conductive element to provide a relatively long region within which electrons drift. in another embodiment, a plurality of forward emitters are positioned so as to create an ionization region in front of the capacitor, with a rear conductive element providing a region within which electrons may drift. In all these capacitors, a leaky dielectric region separates the forward and rearward conductive elements, with electron drift through the leaky dielectric generating motive power. In some instances, this region may simply be an air gap, and in other instances pure or ultrapure semiconductor materials, i.e. materials that exhibit both electron mobility and a dielectric constant, may be used. A plurality of such semiconductor materials are constructed in layers forming the leaky dielectric region.

Click here to see the full patent

Note from JL Naudin : In the Jeffery Cameron's patent from Transdimensional Technologies, all the theoretical part about the " Lorentz force propulsion system " working principle ( see pages 1-7 ) is fully inspired from the document " Review of the application of Newton's third law in physics " from Patrick Cornille published in 1998 in the Elsevier Science " Progress in Energy and Combustion Science " - Vol 25 ( issue 2 - April 1998 ), see chapter 9.1, pages 173-177 : The Lorentz force law and the stimulated force.

The Lifter has been fully tested by the US Army Research Laboratory