David C Liu

US Patent:

6461129, Oct 8, 2002

Filed:

Feb 23, 2001

Appl. No.:

09/791515

Inventors:

David Liu - Vernon Hills IL

Assignee:

MAT Automotive Inc. - Buffalo Grove IL

International Classification:

F03C 200

US Classification:

418 552, 418 555, 418 57, 418107

Abstract:

A scroll type apparatus for fluid displacement is disclosed. In one embodiment, the apparatus includes an adjustment mechanism capable of being adjusted after assembly of the apparatus to close an axial gap between scroll members and account for manufacturing tolerances in apparatus components. In another embodiment, the apparatus includes an orbital scroll of two portions, with a supporting portion surrounding an eccentric bearing of higher density than that of a scroll portion. The center of mass of the orbital scroll is thus moved towards the eccentric bearing to reduce torquing of the scroll as it orbits. In a further embodiment, the apparatus includes an orbital scroll having two portions, a supporting portion surrounding an eccentric bearing having a lower coefficient of thermal expansion than that of a scroll portion, to reduce thermal expansion of the supporting portion, reducing misaligmnent of the eccentric orbital scroll on the bearing.

US Patent:

7960600, Jun 14, 2011

Filed:

Nov 20, 2009

Appl. No.:

12/622824

Inventors:

Stanley J. Frey - Palatine IL, US
Jason T. Corradi - Arlington Heights IL, US
Richard S. Kempf - Deerfield IL, US
David W. Liu - Palatine IL, US

Assignee:

UOP LLC - Des Plaines IL

International Classification:

C07C 7/12
C07C 7/04

US Classification:

585478, 585820, 585805, 585828

Abstract:

Meta-xylene is recovered from admixture with other Caromatic hydrocarbons including ortho-xylene by liquid phase adsorptive separation. Performance is improved by reducing the concentration of ortho-xylene through adding a sidecut to a prefractionator preparing the feedstock to adsorptive separation.

US Patent:

20120051217, Mar 1, 2012

Filed:

Aug 24, 2011

Appl. No.:

13/216513

Inventors:

Leo S. Lee - Downers Grove IL, US
Timothy E. Blair - Griffith IN, US
David H. Liu - Herndon VA, US

Assignee:

Tellabs Operations, Inc. - Naperville IL

International Classification:

H04L 12/26

US Classification:

3702301

Abstract:

Disclosed herein are methods and calculators for configuring traffic allocations for service classes with different Quality of Service (QoS) in a router. Example embodiments involve setting allocations at a router based on traffic rate values and/or traffic weight values provided by a user. The router may monitor actual traffic rates to ensure that traffic is not being dropped due to improper rate allocations and to provide historical data for optimizing traffic allocations. In addition, the router may automatically adjust traffic allocations to avoid dropping high(er) priority traffic. The router may also transmit alarms to the user and/or to other network devices to prompt traffic re-routing and/or re-allocation of traffic rates. Example methods and apparatus ensure appropriate traffic allocation to meet certain QoS metrics.

US Patent:

20130165715, Jun 27, 2013

Filed:

Sep 25, 2012

Appl. No.:

13/626191

Inventors:

UOP LLC - Des Plaines IL, US
David W. Ablin - Arlington Heights IL, US
David W. Liu - Palatine IL, US

Assignee:

UOP LLC - Des Plaines IL

International Classification:

B01D 3/32
C07C 5/22
C07C 2/66
B01J 8/00

US Classification:

585302, 585304, 422187, 2611141, 202239

Abstract:

The xylene isomerization process unit and the transalkylation process units are combined in the present invention. A fractionation column can be shared by the two units, reducing the capital cost of the complex. In some embodiments, a split shell fractionation column and a split separator can be used.

US Patent:

54912679, Feb 13, 1996

Filed:

Mar 7, 1994

Appl. No.:

8/207525

Inventors:

Stanley J. Frey - Palatine IL
David W. Liu - Palatine IL
Charles P. Luebke - Mount Prospect IL
Terry L. Marker - Palatine IL

Assignee:

UOP - Des Plaines IL

International Classification:

C07C 4302

US Classification:

568647

Abstract:

In a process for the production of tertiary ethers by the reaction of an alcohol and isoalkene, a sidecut stream is selected from the etherification separation zone and recycled back to the etherification reaction zone. When this sidecut stream is characterized by an isoalkene to tertiary ether molar concentration ratio that is greater than the isoalkene to tertiary ether molar concentration ratio of the etherification reaction effluent (which is normally at equilibrium conditions), the conversion of isoalkene to tertiary ether is increased.

US Patent:

20140248193, Sep 4, 2014

Filed:

May 16, 2014

Appl. No.:

14/279851

Inventors:

- Des Plaines IL, US
David W. Ablin - Arlington Heights IL, US
David W. Liu - Palatine IL, US

Assignee:

UOP LLC - Des Plaines IL

International Classification:

C07C 6/06
B01D 3/14
C07C 5/27

US Classification:

422187, 261108

Abstract:

The xylene isomerization process unit and the transalkylation process units are combined in the present invention. A fractionation column can be shared by the two units, reducing the capital cost of the complex. In some embodiments, a split shell fractionation column and a split separator can be used.

US Patent:

20140249341, Sep 4, 2014

Filed:

May 16, 2014

Appl. No.:

14/279879

Inventors:

- Des Plaines IL, US
David W. Ablin - Arlington Heights IL, US
David W. Liu - Palatine IL, US

Assignee:

UOP LLC - Des Plaines IL

International Classification:

C07C 6/06
C07C 5/27

US Classification:

585302

Abstract:

The xylene isomerization process unit and the transalkylation process units are combined in the present invention. A fractionation column can be shared by the two units, reducing the capital cost of the complex. In some embodiments, a split shell fractionation column and a split separator can be used.