Nan Chen

US Patent:

20130124105, May 16, 2013

Filed:

Nov 11, 2011

Appl. No.:

13/294566

Inventors:

Estrella Rogel - Orinda CA, US
Cesar Ovalles - Walnut Creek CA, US
Pak Leung - San Ramon CA, US
Nan Chen - San Ramon CA, US

Assignee:

Chevron U.S.A. INC - San Ramon CA

International Classification:

G01N 30/02
G06F 19/00

US Classification:

702 25, 73 6152

Abstract:

Disclosed herein is a method of predicting sediment content of a hydroprocessed hydrocarbon product. The method involves: (a) precipitating an amount of asphaltenes from a liquid sample of a first hydrocarbon-containing feedstock having solvated asphaltenes therein with one or more first solvents; (b) determining one or more solubility characteristics of the precipitated asphaltenes; (c) analyzing the one or more solubility characteristics; (d) determining asphaltene content of the liquid sample from the results of analyzing the one or more solubility characteristics; (e) determining one or more asphaltene stability parameters of the liquid sample from the results of analyzing the one or more solubility characteristics; and (f) correlating the asphaltene content and one of the asphaltene stability parameters of the liquid sample with at least two operation conditions associated with a refinery to predict sediment content.

US Patent:

20130124106, May 16, 2013

Filed:

Nov 11, 2011

Appl. No.:

13/294609

Inventors:

Estrella Rogel - Orinda CA, US
Cesar Ovalles - Walnut Creek CA, US
Pak Leung - San Ramon CA, US
Nan Chen - San Ramon CA, US

Assignee:

CHEVRON U.S.A. INC. - San Ramon CA

International Classification:

G01N 30/04
G06F 19/00
G01N 1/28

US Classification:

702 25, 73 6159, 73 6155

Abstract:

Disclosed herein is a method of estimating sediment content of a hydroprocessed hydrocarbon-containing feedstock. The method involves the steps of: (a) precipitating an amount of asphaltenes from a liquid sample of a first hydroprocessed hydrocarbon-containing feedstock having solvated asphaltenes therein with one or more first solvents in a column; (b) determining one or more solubility characteristics of the precipitated asphaltenes; (c) analyzing the one or more solubility characteristics of the precipitated asphaltenes; (d) determining asphaltene content of the liquid sample from the results of analyzing the one or more solubility characteristics of the precipitated asphaltenes; (e) determining one or more asphaltene stability parameters of the liquid sample from the results of analyzing the one or more solubility characteristics of the precipitated asphaltenes; and (f) correlating the asphaltene content and one of the asphaltene stability parameters of the liquid sample to estimate sediment content of the liquid sample.

US Patent:

20220411678, Dec 29, 2022

Filed:

Oct 22, 2020

Appl. No.:

17/755212

Inventors:

- Los Angeles CA, US
Nan Chen - Los Angeles CA, US
Nichole Escamilla - Los Angeles CA, US
Cesar Blanco - Los Angeles CA, US
Mark Edward Thompson - Los Angeles CA, US

International Classification:

C09J 133/02
C09J 133/26
C08F 220/06
C08F 220/56
C08F 222/10
A61L 15/24
A61L 15/58

Abstract:

Adhesives, particularly reversible adhesives, reversible adhesive hydrogel meshes and polymer formulations that may be used in preparation of the reversible adhesive hydrogel meshes are disclosed. The polymer formulations may comprise a reversible monomer of a reversible adhesive polymer, acrylic acid (AA), an acrylate cross-linker, a photo-initiator for free radical polymerization, and a solvent. The disclosure also relates to a wound dressing comprising the reversible adhesive hydrogel meshes. Such wound dressings are particularly suitable for treatment of damaged sensitive tissue, for example, wounds formed on a fragile skin.

US Patent:

20210238764, Aug 5, 2021

Filed:

Sep 13, 2019

Appl. No.:

17/274084

Inventors:

- Los Angeles CA, US
Bharat Kumar MENON - Los Angeles CA, US
Nan CHEN - Los Angeles CA, US
Heather Michelle GRANDIN - Los Angeles CA, US
Harald NUHN - Los Angeles CA, US
Jenna Brynne LUBET - Los Angeles CA, US

International Classification:

C25D 11/26
A61L 31/08
A61L 31/02
C25D 11/00

Abstract:

Embodiments of methods and apparatuses for forming the metal oxide nanostructure on surfaces are disclosed. In certain embodiments, the nanostructures can be formed on a substrate made of a nickel titanium alloy, resulting in a nanostructure that can include both titanium oxide and nickel oxide. The nanostructure can be formed on the surface(s) of an implantable medical device, such as a stent.

US Patent:

20200240034, Jul 30, 2020

Filed:

Sep 21, 2018

Appl. No.:

16/648429

Inventors:

- Los Angeles CA, US
Nan Chen - Temple City CA, US
Bharat Kumar Menon - Los Angeles CA, US
Heather Michelle Grandin - San Diego CA, US
Cesar Escobar Blanco - Los Angeles CA, US

International Classification:

C25D 11/26
C25D 11/34

Abstract:

Embodiments of nanostructures comprising metal oxide and methods for forming the nanostructure on surfaces are disclosed. In certain embodiments, the nanostructures can be formed on a substrate made of a nickel titanium alloy, resulting in a nanostructure containing both titanium oxide and nickel oxide. The nanostructure can include a lattice layer disposed on top of a nanotube layer. The distal surface of the lattice layer can have a titanium oxide to nickel oxide ratio of greater than 10:1, or about 17:1, resulting in a nanostructure that promotes human endothelial cell migration and proliferation at the interface between the lattice layer and human cells or tissue. The nanostructure may be formed on the outer surface of an implantable medical device, such a stent or an orthopedic implant (e.g. knee implant, bone screw, or bone staple).

US Patent:

20170165639, Jun 15, 2017

Filed:

Mar 1, 2017

Appl. No.:

15/446388

Inventors:

- Columbia MD, US
Nan Chen - Berkeley CA, US
Matthew P. Woods - Pasadena MD, US
Bruno Nesci - Oak Lawn IL, US

International Classification:

B01J 21/04
B01J 37/02
C10G 47/10
B01J 35/10
C10G 45/08
B01J 23/883
B01J 37/08

Abstract:

A supported catalyst useful in processes for chemically refining hydrocarbon feedstocks is prepared, the catalyst comprising a metal from Group 6 of the Periodic Table, a metal from Groups 8, 9 or 10 and optionally phosphorous, wherein the metals, and phosphorous when present, are carried on a foraminous carrier or support, the carrier or support, preferably comprises porous alumina having a total pore volume (TPV) of about 0.6 cc/g to about 1.1 cc/g and comprising: (a) equal to or greater than about 78% to about 95% of TPV in pores having a diameter of less than about 200 Angstroms (Å); (b) greater than about 2% to less than about 19% of the TPV in pores having a diameter of about 200 (Å) to less than about 1000 Å; (c) equal to or greater than 3% to less than 12% of the TPV in pores having a diameter equal to or greater than about 1000 Å; and (d) a pore mode equal to or greater than about 90 Å and less than about 160 Å. Preferably the support exhibits a d50 greater than about 100 Å and less than about 150 Å.

US Patent:

20170110958, Apr 20, 2017

Filed:

Oct 20, 2015

Appl. No.:

14/918163

Inventors:

- San Diego CA, US
Yuan-cheng PAN - Saratoga CA, US
Junmou ZHANG - San Diego CA, US
Nan CHEN - San Diego CA, US
Mohamed Waleed ALLAM - San Diego CA, US

International Classification:

H02M 1/14
H02M 3/156
H02M 1/08

Abstract:

An apparatus and a method to adjust a source voltage based on an operating voltage response are provided. The apparatus includes a circuit configured to change state from a first state to a second state comprising receiving an operating voltage from a power source through a power distribution network. The apparatus further includes a sensor configured to measure an operating voltage response to the circuit changing state to receiving the operating voltage. The apparatus further includes a control circuit configured to adjust a source voltage at the power source based on the operating voltage response measured by the sensor. The method includes changing a state to receiving an operating voltage from a power source through a power distribution network, measuring an operating voltage response to the changing state to receiving the operating voltage, and adjusting the source voltage at the power source based on the measured operating voltage response.

US Patent:

20150166905, Jun 18, 2015

Filed:

Mar 2, 2015

Appl. No.:

14/635407

Inventors:

- Columbia MD, US
Nan Chen - Berkeley CA, US
Matthew P. Woods - Pasadena MD, US
Bruno Nesci - Oak Lawn IL, US

International Classification:

C10G 65/00
C10G 47/12
C10G 45/08

Abstract:

A supported catalyst useful in processes for chemically refining hydrocarbon feedstocks is prepared, the catalyst comprising a metal from Group 6 of the Periodic Table, a metal from Groups 8, 9 or 10 and optionally phosphorous, wherein the metals, and phosphorous when present, are carried on a foraminous carrier or support, the carrier or support, preferably comprises porous alumina having a total pore volume (TPV) of about 0.6 cc/g to about 1.1 cc/g and comprising: (a) equal to or greater than about 78% to about 95% of TPV in pores having a diameter of less than about 200 Angstroms (Å); (b) greater than about 2% to less than about 19% of the TPV in pores having a diameter of about 200 (Å) to less than about 1000 Å; (c) equal to or greater than 3% to less than 12% of the TPV in pores having a diameter equal to or greater than about 1000 Å; and (d) a pore mode equal to or greater than about 90 Å and less than about 160 Å. Preferably the support exhibits a d50 greater than about 100 Å and less than about 150 Å.