Steven G Knowles

US Patent:

6513760, Feb 4, 2003

Filed:

Dec 11, 2000

Appl. No.:

09/735201

Inventors:

George E. Mueller - Kirkland WA
Richard H. Kohrs - Kirkland WA
David B. Cochran - Bellevue WA
Joseph W. Cuzzupoli - Kirkland WA
Charles D. Limerick - Issaquah WA
Richard A. Bailey - Canyon Country CA
Thomas G. Johnson - Bellevue WA
Steven C. Knowles - Puyallup WA

Assignee:

Kistler Aerospace Corporation - Kirkland WA

International Classification:

F03H 500

US Classification:

244172, 244158 R, 244161

Abstract:

An orbital vehicle ( ) having a propulsion module ( ) and a logistics module ( ). The logistics module includes a generally cylindrical outer shell ( ) with first and second ends. An openable cover ( ) is coupled with the outer shell at the first end, thereby providing access to the interior of the logistics module. The second end is adapted to couple to the propulsion module. A cargo container ( ) is disposed generally within the outer shell, the cargo container including a berthing mechanism ( ) disposed to be accessible when the cover is opened. A retractable grapple fixture ( ) is provided on the logistics module, selectively positionable between an extended position and a retracted position. When the grapple fixture is in the extended position a grapple shaft ( ) can be accessed to secure the orbital vehicle. When the grapple fixture is retracted, it is enclosed within the orbital vehicle.

US Patent:

55607799, Oct 1, 1996

Filed:

Jul 12, 1993

Appl. No.:

8/090842

Inventors:

Steven C. Knowles - Seattle WA
Alan E. Kull - Seattle WA
George W. Butler - Seattle WA
David O. King - Woodinville WA

Assignee:

Olin Corporation - Redmond WA

International Classification:

C23C 1626
C23C 1650

US Classification:

118723MP

Abstract:

There is provided a system for the manufacture of a diamond film. A plasma generator generates a hydrogen atom containing plasma stream into which a hydrocarbon containing gas is fed. The plasma dissociates the hydrocarbon to carbon radicals and carbon which are deposited on a substrate where the carbon crystallizes to a diamond film. The efficiency of the system is increased by heating the hydrogen source gas prior to generation of the plasma. Other means to increase the effectiveness of the system include using a plurality of plasma streams and shaping the plasma stream, A low internal strain, high quality optical film is generated by depositing the carbon on a substrate supported by a heat sink having nonuniform thermal conductivity such that the thermal gradient across the surface of the heat sink is less than about 8. degree. C. /centimeter.

US Patent:

48007161, Jan 31, 1989

Filed:

Jul 23, 1986

Appl. No.:

6/889451

Inventors:

William W. Smith - Seattle WA
Steven C. Knowles - Seattle WA

Assignee:

Olin Corporation - Stamford CT

International Classification:

F03H 100

US Classification:

602031

Abstract:

An improved efficiency arcjet thruster has a constrictor and electrically-conductive nozzle anode defining an arc chamber, and an electrically-conductive rod having a tip spaced upstream from the constrictor and defining a cathode spaced from the anode by a gap generally coextensive with the arc chamber. An electrical potential is applied to the anode and cathode to generate an electrical arc in the arc chamber from the cathode to anode. Catalytically decomposed hydrazine is supplied to the arc chamber with generation of the arc so as to produce thermal heating and expansion thereof through the nozzle. The constrictor can have a electrically insulative portion disposed between the cathode tip and the nozzle anode, and an electrically-conductive anode extension disposed along the insulative portion so as to define an auxiliary gap with the cathode tip substantially smaller than the gap defined between the cathode and nozzle anode for facilitating startup of arc generation. The constrictor can also include an electrically-conductive electrode with a variable electrical potential to vary the shape of the arc generated in the arc chamber. Also, the cathode is mounted for axial movement such that the gap between its tip and the nozzle anode can be varied to facilitate a generally nonerosive generation of the electrical arc at startup and reliable steady state operation.

US Patent:

48054003, Feb 21, 1989

Filed:

Apr 27, 1987

Appl. No.:

7/042994

Inventors:

Steven C. Knowles - Seattle WA

Assignee:

Olin Corporation - Stamford CT

International Classification:

F03H 100

US Classification:

602031

Abstract:

A non-erosive arcjet starting control system and method are provided in combination with an arcjet thruster which includes an anode, a cathode and a gap defined therebetween. The starting control system and method include the operative steps of, first, actuating a valve in a propellant gas feed path to an opened position thereby permitting flow of propellant gas at a predetermined pressure into the thruster past the gap therein, second, applying to the anode and cathode an electrical potential of a predetermined magnitude being less than that required to generate an electrical arc across the gap through propellant gas at the predetermined flow pressure and, concurrently, actuating the valve to its closed position thereby preventing flow of propellant gas into the thruster past the gap and thereby lowering the flow pressure of the propellant gas in the thruster below the predetermined pressure such that an electrical arc is now generated in the thruster across the gap and, finally, actuating the valve to its opened position thereby permitting propellant gas to flow again at the predetermined pressure into the thruster past the gap and force the electrical arc to move downstream within the thruster so as to minimize erosion in the constrictor. The flow of propellant into the thruster is prevented for only a short period of time.

US Patent:

48824658, Nov 21, 1989

Filed:

Oct 1, 1987

Appl. No.:

7/103471

Inventors:

William W. Smith - Seattle WA
Steven C. Knowles - Seattle WA

Assignee:

Olin Corporation - Stamford CT

International Classification:

B23K 900

US Classification:

21912148

Abstract:

An arcjet thruster has a constrictor and nozzle defining an arc chamber. The constrictor has an insulator and an anode. The constrictor defines a subsonic-to-supersonic transition zone axially coextensive with the inculator and anode. The anode is disposed side-by-side with the insulator and located upstream therefrom. A rod defines a cathode spaced from the anode by a gap. An electrical potential is applied to the anode and cathode to generate an electrical arc in the chamber which produces thermal heating of propellant gases flowing through the chamber and expansion thereof through the nozzle. Location of the insulator downstream from the anode causes diffusion and attachment of the arc to occur at the region of the anode in the constrictor and prevents movement of the arc diffusion and attachment region downstream past the insulator to the nozzle in response to propellant gas mass flow variations through the constrictor. The thruster can also include an expansion and compression cavity in the arc chamber to provide a low pressure region at the anode for arc attachment and diffusion. Further, a zone of thermal and mechanical isolation can be provided between the anode and insulator to reduce the temperature at the insulator and displace its location farther away from the region of arc attachment and diffusion at the anode.