Li Hua Chen

US Patent:

6379381, Apr 30, 2002

Filed:

Sep 3, 1999

Appl. No.:

09/390069

Inventors:

Syed F. A. Hossainy - Fremont CA
Li Chen - San Jose CA

Assignee:

Advanced Cardiovascular Systems, Inc. - Santa Clara CA

International Classification:

A61F 206

US Classification:

623 142, 623 143, 623 115, 623 237

Abstract:

An implantable prosthesis, for example a stent, is provided that is capable of being loaded with substances. In one example, the prosthesis is a cylindrical-shaped body having depots or pores formed thereon. The depots can be formed at preselected locations on the body of the prosthesis and can have a preselected depth, size, and shape. The depots can have various shapes including a cylindrical or a conical shape. Substances such as therapeutic substances, polymeric materials, polymeric materials containing therapeutic substances, radioactive isotopes, and radiopaque materials can be deposited into the depots.

US Patent:

6445734, Sep 3, 2002

Filed:

Jun 30, 1999

Appl. No.:

09/343873

Inventors:

Li Chen - Irvine CA
Farhad Aminian - Irvine CA
Keith T. Chu - Laguna Niguel CA

Assignee:

Conexant Systems, Inc. - Newport Beach CA

International Classification:

H03H 730

US Classification:

375231, 375232, 375350, 708305, 708323

Abstract:

Equalizer training is validated by techniques to detect false training. The validation techniques involve checking the unique time domain energy shaping of a plurality of taps of a trained equalizer of a modem for good training. The energy measure for each equalizer tap of the plurality of taps is approximated by summing the magnitude of a real component and a magnitude of an imaginary component of an equalizer coefficient corresponding to the equalizer tap. A tap with a highest approximate energy (i. e. , the main tap) is then determined. Next, the main tap energy is compared to a main tap threshold and a predetermined guarding threshold. The plurality of taps are arranged in a time index ordered sequence. In determining the main tap threshold, a first energy sum of a beginning set of taps in the sequence is compared with a second energy sum of a last set of taps in the sequence. The lesser tap energy sum between the first energy sum and the second energy sum is the main tap threshold.

US Patent:

6558733, May 6, 2003

Filed:

Oct 26, 2000

Appl. No.:

09/697104

Inventors:

Syed F. A. Hossainy - Fremont CA
Li Chen - San Jose CA

Assignee:

Advanced Cardiovascular Systems, Inc. - Santa Clara CA

International Classification:

B05D 132

US Classification:

427 224, 427 21, 427 228, 427534, 427555, 427556, 427554, 427154, 427155, 427156, 427282, 427287, 427271, 427272, 427273, 427300, 427307, 216 8, 216 9, 216 10, 216 41, 216 44, 216 45, 216 56, 216 94, 216106, 216108, 216109

Abstract:

An implantable prosthesis, for example a stent, is provided having one or more micropatterned microdepots formed in the stent. Depots are formed in the prosthesis via chemical etching and laser fabrication methods, including combinations thereof. They are formed at preselected locations on the body of the prosthesis and have a preselected depth, size, and shape. The depots can have various shapes including a cylindrical, a conical or an inverted-conical shape. Substances such as therapeutic substances, polymeric materials, polymeric materials containing therapeutic substances, radioactive isotopes, and radiopaque materials can be deposited into the depots.

US Patent:

6560321, May 6, 2003

Filed:

Sep 27, 1999

Appl. No.:

09/405581

Inventors:

Li Chen - Stanford CA
Keith Chu - Laguna Niguel CA

Assignee:

Conexant Systems, Inc. - Newport Beach CA

International Classification:

H04M 1100

US Classification:

37910017, 37910001, 370292, 375222

Abstract:

A half-duplex facsimile modem system according to the present invention may exhibit a shorter startup time relative to conventional systems. The modem system exchanges capabilities information concurrently with the transmission of a conventional answer signal, thus obviating the need for performing a separate capabilities exchange procedure. In addition, the modem system is capable of determining a preferred training sequence duration based upon one or more characteristics of the current channel. The preferred training sequence duration is communicated from the answer modem to the calling modem such that the calling modem can format the training sequence in an appropriate manner. The resultant training sequence has a time duration that is variable in response to, e. g. , the signal-to-noise ratio of the instant channel. These techniques can result in a significant reduction in the startup latency typically associated with conventional half-duplex facsimile modem systems.

US Patent:

6563977, May 13, 2003

Filed:

Jun 27, 2000

Appl. No.:

09/605523

Inventors:

Li Chen - Fremont CA
Shu Zhang - Fremont CA
Wei Yang - Fremont CA

Assignee:

Bayspec, Inc. - Fremont CA

International Classification:

G02B 628

US Classification:

385 24, 385 31, 385 33, 359115, 359122

Abstract:

An optical multiplexing and demultiplexing device includes: a fiber mounting means for securing a plurality of optical fibers each terminating in a fiber end, at least one of the fiber ends radiating a corresponding input beam having a polarization state defined by a polarization plane that may vary as a function of time, and at least one of the fiber ends for receiving an output beam; collimating and focusing means having a focal length, and providing collimation of the input beams, and focusing of the output beams; diffraction means including at least one diffractive element providing for dispersion of optical beams passing therethrough, each diffractive element having an associated diffraction efficiency that varies as a function of the polarization state of light beams passing therethrough; and a polarization rotating means for rotating the plane of polarization of a beam passing therethrough by a specified number of degrees. The device provides for a particular input beam having a first polarization state to be diffracted by the diffractive elements in accordance with a first diffraction efficiency based on the first polarization state. The beam is then passed through the polarization rotating means at least once and thereby rotated into a second polarization state.

US Patent:

6585765, Jul 1, 2003

Filed:

Jun 29, 2000

Appl. No.:

09/608444

Inventors:

Syed F. A. Hossainy - Fremont CA
Jacqueline Ghio - San Carlos CA
Li Chen - San Jose CA

Assignee:

Advanced Cardiovascular Systems, Inc. - Santa Clara CA

International Classification:

A61F 206

US Classification:

623 145, 623 66, 427 224

Abstract:

The present invention provides a method of impregnating an implantable device, such as a vascular graft or a covering adapted to be disposed over a prosthesis. The substances may be impregnated within the implantable device as a passive coating or as a delivery matrix for a therapeutic substance. Also provided is an implantable device having such substances impregnated therein.

US Patent:

6624403, Sep 23, 2003

Filed:

Oct 11, 2001

Appl. No.:

09/975515

Inventors:

Li Chen - Fremont CA
Martin Ebert - Fremont CA
Dale Linseth - Hollister CA

Assignee:

Therma-Wave, Inc. - Fremont CA

International Classification:

G02B 2740

US Classification:

2502012, 2502014, 25055929, 396 89

Abstract:

An autofocus system for maintaining a sample in the focal plane of a primary lens is disclosed. A light source generates a monitor beam which is focused onto the sample through the primary lens. The reflected beam passes back through the primary lens and is directed to a secondary lens. The beam is then split by a reflective wedge into two portions with different path lengths such that the beam waists of the two portions are spatially separated. An aperture is located between the two beam waists. A bi-cell photodetector measures the intensity of the two beam portions transmitted by the aperture. The measured intensity levels vary with respect to the position of the sample. By comparing the measured intensity levels, an indication of the position of the sample can be obtained.

US Patent:

6671428, Dec 30, 2003

Filed:

Mar 20, 2001

Appl. No.:

09/813772

Inventors:

Wei Yang - Fremont CA
Shu Zhang - Fremont CA
Li Chen - Fremont CA

Assignee:

Bayspec, Inc. - Fremont CA

International Classification:

G02B 626

US Classification:

385 18, 385 37

Abstract:

An optical cross switch device for selectively switching light beams between a plurality of fiber optic elements. The device includes an input fiber mounting assembly for securing at least one input fiber terminating in a fiber end for radiating an associated input light beam; collimating means for collimating the at least one input light beam; focusing means for focusing light beams incident thereon; an output fiber mounting assembly for securing at least one output fiber terminating in an output fiber end for receiving an associated light beam; and at least one mirror unit having at least one reflective element for selectively redirecting an associated one of the collimated input light beams toward an associated selected one of the output fiber ends via the focusing means.