Meng Chen

US Patent:

6613432, Sep 2, 2003

Filed:

Dec 21, 2000

Appl. No.:

09/746234

Inventors:

Paul O. Zamora - Gaithersburg MD
Shigemasa Osaki - Sandy UT
Meng Chen - Salt Lake City UT

Assignee:

BioSurface Engineering Technologies, Inc. - College Park MD

International Classification:

B32B 1504

US Classification:

428409, 427 224, 427539, 428457, 428469, 428544, 428685

Abstract:

Coatings, devices and methods are provided, wherein the contacting surface of a medical device with at least one contacting surface for contacting a bodily fluid or tissue is modified by plasma treatment in a plasma comprising nitrogen-containing molecules and oxygen-containing molecules. The nitrogen-containing molecules include NH , (NH ) , N O, NO, NO and N O , and the oxygen-containing molecules include O and O. The plasma-modified contacting surface exhibits decreased adhesion of at least some mammalian cells, such as platelets and leukocytes, decreased restenosis when used with stents, and increased apoptosis. Additional layers may be applied, including plasma polymerized hydrocyclosiloxane monomers, amine-providing groups such as N-trimethylsilyl-allylamine, polyoxyalkylene tethers, and bioactive compounds.

US Patent:

7720131, May 18, 2010

Filed:

Jun 27, 2007

Appl. No.:

11/769537

Inventors:

Vikash Srivastava - Boyds MD, US
Meng Chen - Frederick MD, US

Assignee:

PC-Tel, Inc. - Bloomingdale IL

International Classification:

H04L 27/30

US Classification:

375144, 375148, 375349, 375365, 370503, 455 6711, 4552261

Abstract:

A method and apparatus are provided for decoding a wireless signal from a set of samples with an embedded training sequence. The method includes the steps of determining a first frequency offset from the samples where the first frequency offset is assumed to be less than a Nyquist frequency of the training sequence and calculating a first carrier to interference ratio based upon the first frequency offset. The method further includes the steps of determining a second frequency offset from the samples by subtracting an absolute value of the first frequency offset from an integer multiple of the Nyquist frequency and giving the second frequency offset a sign opposite that of the first frequency offset, calculating a second carrier to interference ratio based upon the second frequency offset and selecting one of the first and second frequency offsets based upon a relative values of the calculated carrier to interference ratios.