Young H Bae

7413147, Aug 19, 2008

Jul 22, 2006

11/491830

Young Kun Bae - Tustin CA, US

B64G 1/24

244164, 2441582, 2441715

The invention is a system and method for propellantless, ultrahigh precision satellite formation flying based on ultrahigh precision intracavity laser thrusters and tethers with an intersatellite distance accuracy of nanometers at maximum estimated distances of tens of kilometers. The repelling force of the intracavity laser thruster and the attracting force of tether tension between satellites form the basic forces to stabilize matrix structures of satellites. Users of the present invention can also use the laser thruster for ultrahigh precision laser interferometric metrology, resulting in simplification and payload weight reduction in integrating the thruster system and the metrology system.

20080197238, Aug 21, 2008

Nov 20, 2007

11/943480

Young Kun Bae - Tustin CA, US

H01S 3/08

2441711, 372107

The invention is a system and method for propelling and slowing down spacecraft and other space systems and objects using the thrust generated from the direct laser photon momentum transfer between two platforms to and from unprecedented high speeds approaching the speed of light. The thrust from the direct laser photon momentum is amplified in an intracavity arrangement, in which laser photons bounce between two high reflectance mirrors separately located in two platforms. The laser gain medium is typically located between two mirrors, and amplifies the intracavity photon power, thus creating amplified thrust. This intracavity medium location arrangement offers two critical advantages: 1) the ability to maintain the intracavity photon power constant when the distance between the mirrors rapidly changes; and 2) the ability to overcome the power loss mechanisms, such as scattering and absorption.Furthermore, the current invention can be used for controlling the position and attitude of multiple spacecraft or spacecrafts in high precision formation flying or fractionated spacecraft architecture. This is advantageous over other propulsion concepts, such as chemical propulsion and laser beamed energy plasma or ablation propulsion, because the invention provides the highest specific impulse and dose not require any propellant, thus, significantly increases the payload fraction (payload weight/the total rocket weight), significantly decreases the payload launching cost, and is able to propel the spacecraft to velocities approaching the speed of light.

43369731, Jun 29, 1982

Aug 4, 1980

6/175336

Young Bae - Los Angeles CA

A47B 4300
A47B 8700

312199

A folding clothes hanger including a first wall member, at least one clothes hanger mounted on the first wall member, a second wall member, at least one clothes hanger mounted on the second wall member, and a central post portion and with both the first and second wall members extending from and attached to the central post portion at angularly spaced positions and with at least one of the first and second wall members pivotably mounted to the central post portion for providing for at least a closed position with the first and second wall members lying substantially parallel to each other and an open position with the first and second wall members lying at an angular relationship to each other.