TAE CATHERINE PARK
Broker in Cambridge, MA

6804440, Oct 12, 2004

Dec 7, 2002

10/314431

Kevin K. Lee - Malden MA
Desmond R. Lim - Singapore, SG
Tae H. Park - Cambridge MA

LNL Technologies, Inc. - Cambridge MA

G02B 612

385114, 385 28, 385 50

An integrated device includes a waveguide, which may be connected to a photonic circuit and an external fiber, and an on-chip device formed on an optical chip by forming a region in which the waveguide terminates. The region is bounded by reflective surfaces. Light coming from the waveguide is essentially trapped inside the region and directed to an on-chip device disposed in the region. An integrated device consists of a low index difference waveguide, an on-chip mode converter, a high index difference waveguide, and an on-chip function formed on a single optical chip so that the high index difference waveguide is close to the substrate surface upon which the mode converter is formed. Substrate surface height differences are provided to define different substrate surface mounting heights for a low index difference waveguide, high index difference waveguide, a mode converter, and an on-chip device. The height differentials provide close proximity of components allowing on-chip devices, such as a Ge detector or electronics, to be integrated on a chip with the high index difference waveguide that is connected to a mode converter.

5330768, Jul 19, 1994

Jul 5, 1991

7/726349

Tae G. Park - Cambridge MA
Smadar Cohen - Petach-Tickva, IL
Robert S. Langer - Newton MA

Massachusetts Institute of Technology - Cambridge MA

A61K 916

424501

A new series of degradable polymeric matrices were prepared by blending polymers that degrade by hydrolysis such as poly(L-lactic acid)(PLA), and nonionic Pluronic. TM. surfactants, block copolymers of polyethyleneoxide (PEO) and polypropyleneoxide (PPO). The water content of the polymer blend films was controlled by mixing different types of block copolymers and by adjusting their amount. In aqueous solution, the blends revealed the typical liquid-crystalline phase transition of Pluronic. TM. polymers, suggesting the formation of a gel-like structure within the polymer skeleton. Poly(lactic acid) degradation rates were not affected by the blending procedure, although the hydration degree in these matrices was higher. When used as drug-releasing matrices, these blends extended protein release and minimized the initial protein burst, as compared to the pure polymer.