James S Sovey

42186331, Aug 19, 1980

Oct 23, 1978

5/953391

Michael J. Mirtich - N. Olmsted OH
James S. Sovey - Strongsville OH
Robert F. Roman - Brookpark OH

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

H01J 1726

313362

A source of hydrogen ions is disclosed and includes a chamber having at one end a cathode which provides electrons and through which hydrogen gas flows into the chamber. Screen and accelerator grids are provided at the other end of the chamber. A baffle plate is disposed between the cathode and the grids and a cylindrical baffle is disposed coaxially with the cathode at the one end of the chamber. The cylindrical baffle is of greater diameter than the baffle plate to provide discharge impedance and also to protect the cathode from ion flux. An anode electrode draws the electrons away from the cathode. The hollow cathode includes a tubular insert of tungsten impregnated with a low work function material to provide ample electrons. A heater is provided around the hollow cathode to initiate electron emission from the low work function material.

46041818, Aug 5, 1986

Jul 31, 1985

6/761235

Michael J. Mirtich - North Olmsted OH
James S. Sovey - Strongsville OH
Bruce A. Banks - Olmsted Township, Cuyahoga County OH

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

C23C 1446

204298

A polymeric substrate 10 is coated with a metal oxide film 22 to provide oxidation protection in low earth orbital environments. The film contains about 4 volume percent polymer to provide flexibility. A coil of polymer material 30, 42 moves through an ion beam 14 as it is fed between reels. The ion beam first cleans the polymer material surface and then sputters the film material from a target 24 onto this surface.

46088210, Sep 2, 1986

Jul 31, 1984

6/636463

Ralph J. Zavesky - Parma OH
James S. Sovey - Strongsville OH
Michael J. Mirtich - North Olmsted OH
Charalampus Marinos - Middleburg Hts. OH
Paul F. Penko - Berea OH

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

H05B 700

602031

An electrothermal thruster utilizes a generally cylindrical heat exchanger chamber. A textured, high emissivity heater element radiatively transfers heat to the inner wall of this chamber that is ion beam morphologically controlled for high absorptivity. This, in turn, raises the temperature of a porous heat exchanger material in an annular chamber surrounding the cylindrical chamber. Propellant gas flows through the annular chamber and is heated by the heat exchanger material.

45605777, Dec 24, 1985

Sep 11, 1984

6/649330

Michael J. Mirtich - North Olmsted OH
James S. Sovey - Strongsville OH
Bruce A. Banks - Olmsted Township, Cuyahoga County OH

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

B05D 306

427 38

A polymeric substrate 10 is coated with a metal oxide film 22 to provide oxidation protection in low earth orbital environments. The film contains about 4 volume percent polymer to provide flexibility. A coil of polymer material 30, 42 moves through an ion beam 14 as it is fed between reels. The ion beam first cleans the polymer material surface and then sputters the film material from a target 24 onto this surface.

44662424, Aug 21, 1984

Mar 9, 1983

6/473498

James S. Sovey - Strongsville OH
Vincent K. Rawlin - Wellington OH
Robert F. Roman - Brook Park OH

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

F03H 500

60202

An improved ion thruster (10) for low specific impulse operation in the 1500 sec to 6000 sec range has a multicusp boundary field (48) provided by high strength magnets (30-38) on an iron anode shell (14) which lengthens the paths of electrons from a hollow cathode assembly (20). A downstream anode pole piece in the form of an iron ring (40) supports a ring of magnets (44) to provide a more uniform beam profile. A cylindrical cathode magnet (46) can be moved selectively in an axial direction along a feed tube (22) to produce the desired magnetic field at the cathode tip (24).

43293859, May 11, 1982

Dec 19, 1980

6/218587

Bruce A. Banks - Olmsted Township, Cleveland County OH
Albert J. Weigand - Lakewood OH
James S. Sovey - Strongsville OH

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

B29D 702
C23C 1500
B32B 2716

428141

This invention is concerned with fabricating textured surfaces on polymers without altering their surface chemistries. A surface of a fluorocarbon polymer 10 is exposed to a beam 12 of ions from a source 14 to texture it. The polymer 18 which is to be surface-roughened is then cast over the textured surface 20 of the fluorocarbon polymer. After curing, the cast polymer is peeled off the textured fluorocarbon polymer, and the peeled off surface 22 has a negative replica of the textured surface 20. The microscopic surface texture provides large surface areas for adhesive bonding. In cardiovascular prosthesis applications the surfaces are relied on for the development of a thin adherent well nourished thrombus.

41996500, Apr 22, 1980

Nov 7, 1978

5/958575

Michael J. Mirtich - N. Olmsted OH
James S. Sovey - Strongsville OH

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

B05D 306

428421

An electron bombardment argon ion source is used to treat polyimide and fluorinated ethylene propylene polymers to form textured surfaces thereon. This improves the optical and electrical properties so that these polymers can be used in industrial and space applications.

44902298, Dec 25, 1984

Jul 9, 1984

6/628866

Michael J. Mirtich - North Olmsted OH
James S. Sovey - Strongsville OH
Bruce A. Banks - Olmsted Township, Cuyahoga County OH

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

C23C 1500

204192C

A diamondlike carbon film is deposited in the surface of a substrate by exposing the surface to an argon ion beam containing a hydrocarbon. The current density in the ion beam is low during initial deposition of the film. Subsequent to this initial low current condition, the ion beam is increased to full power. At the same time a second argon ion beam is directed toward the surface of the substrate. The second ion beam has an energy level much greater than that of the ion beam containing the hydrocarbon. This addition of energy to the system increases mobility of the condensing atoms and serves to remove lesser bound atoms.