Qiang Zheng

US Patent:

6583196, Jun 24, 2003

Filed:

Dec 27, 2000

Appl. No.:

09/748749

Inventors:

Qiang Zheng - Palo Alto CA

Assignee:

Rodenstock North America, Inc. - Hayward CA

International Classification:

C08F 248

US Classification:

522 12, 522 18, 522 39, 522 42, 522 44, 522 46, 522 64, 522181, 522182, 526 89, 526328

Abstract:

A high refractive index composition comprising a core resin mixture comprising a first compound of formula (I), a second compound of a poly(ethylene glycol) di(meth)acrylate of formula (II) and a reactive diluent to provide enhanced impact resistance and refractive index.

US Patent:

6933325, Aug 23, 2005

Filed:

Oct 11, 2002

Appl. No.:

10/269091

Inventors:

Qiang Zheng - Palo Alto CA, US
Donald Scott Nelson - San Ramon CA, US
Manfred Melzig - Wessling, DE
Herbert Schuster - Emmering, DE
Herbert Zinner - Rohrbach, DE

Assignee:

Rodenstock GmbH - Munich

International Classification:

C08F002/46
C08F002/50

US Classification:

522100, 522101, 522 13, 522 18, 522102, 522103, 522153, 522150, 522167, 522 75, 522181, 252582, 252586, 252588, 252589, 264 11, 264 127, 264 132, 264 136, 264494, 264496, 359241, 359242, 359244, 351159, 351160 R, 351162, 523106, 523108

Abstract:

A high refractive index, curable, synthetic resin composition comprising a core resin composition composed of a mixture of ethylenically unsaturated compounds, and an initiation system containing both photo and thermal initiators, particularly a photochromic resin composition which further includes at least one photochromic dye. Also a curing process, which includes a combination of multi-step radiation curing and thermal annealing. Articles produced of cured composition exhibit superior physical and, in appropriate cases, photochromic properties and can be easily mass produced on a commercial scale due to short processing time and use of readily available chemicals.

US Patent:

8114883, Feb 14, 2012

Filed:

Oct 10, 2008

Appl. No.:

12/287520

Inventors:

David Taft - Atherton CA, US
Stelios Tzannis - Newark CA, US
Wei-Guo Dai - Sunnyvale CA, US
Sandra Ottensmann - Mountain View CA, US
Steven Bitler - Menlo Park CA, US
Qiang Zheng - Palo Alto CA, US
Adam Bell - Pacifica CA, US

Assignee:

Landec Corporation - Menlo Park CA

International Classification:

A61K 31/519
A61K 31/196

US Classification:

51425941, 514567

Abstract:

Delivery of drugs in association with PLGA polymers which have crystallinity resulting from the presence of long chain alkyl groups in terminal units.

US Patent:

8399007, Mar 19, 2013

Filed:

Sep 25, 2008

Appl. No.:

12/284755

Inventors:

David Taft - Atherton CA, US
Stelios Tzannis - Newark CA, US
Wei-Guo Dai - Sunnyvale CA, US
Sandra Ottensmann - Mountain View CA, US
Steven Bitler - Menlo Park CA, US
Qiang Zheng - Palo Alto CA, US
Adam Bell - Pacifica CA, US

Assignee:

Landec Corporation - Menlo Park CA

International Classification:

A61F 2/00
A61K 31/74
A61K 31/519
A61K 31/19

US Classification:

424423, 424 7817, 51425941, 514567

Abstract:

Methods for making formulations of drugs and crystalline side chain polymers which formulations provide controlled and/or sustained release drug formulations.

US Patent:

8524259, Sep 3, 2013

Filed:

Dec 3, 2008

Appl. No.:

12/746178

Inventors:

David D. Taft - Atherton CA, US
Steven Bitler - Menlo Park CA, US
Qiang Zheng - Palo Alto CA, US
Stelios Tzannis - Newark CA, US
Adam Bell - Portsmouth NH, US
Wei-Guo Dai - Sunnyvale CA, US
Sandra N. Ottensmann - Mountain View CA, US
Natarajan Balachander - West Lafayette IN, US

Assignee:

Landec Corporation - Menlo Park CA

International Classification:

C08G 63/06

US Classification:

424401, 424405, 424 59, 424 65, 424 941, 525450

Abstract:

Systems and methods for delivering release materials, for example drugs and other bioactive materials. Crystalline polymeric systems, referred to as CYC carriers, are associated with the release materials, through chemical bonding or through physical association. The crystallinity of the CYC carriers results from the presence of crystallizable side chains, for example long chain n-alkyl moieties, which results in relatively low and sharp melting temperatures. One class of CYC carriers, referred to as CYSC polymers, have a majority of the crystallizable side chains pendant from the polymer backbone. Another class of CYC carriers referred to as ECC polymers, have a majority of the crystallizable side chains attached to terminal units of the polymer backbone. The ECC polymers can for example be obtained by modification of PLGA polymers. The CYC carriers in another class of non-polymeric.

US Patent:

8529922, Sep 10, 2013

Filed:

Feb 14, 2012

Appl. No.:

13/372510

Inventors:

David Taft - Atherton CA, US
Stelios Tzannis - Newark CA, US
Wei-Guo Dai - Sunnyvale CA, US
Sandra Ottensmann - Mountain View CA, US
Steven Bitler - Menlo Park CA, US
Qiang Zheng - Palo Alto CA, US
Adam Bell - Pacifica CA, US

Assignee:

Landec Corporation - Menlo Park CA

International Classification:

A61K 38/02
A61K 31/195
A61K 31/519
A61K 47/34
C08G 63/06
C08G 63/91

US Classification:

424401, 424405, 424 59, 424 65, 424 941, 525450, 514 11, 5147723, 5147721, 51425941, 514567, 528361

Abstract:

PLGA, PLA and PGA polymers which have crystallinity resulting from the presence of long chain alkyl groups in terminal units. The polymers are particularly useful for drug delivery.

US Patent:

20080269105, Oct 30, 2008

Filed:

Dec 4, 2007

Appl. No.:

11/999415

Inventors:

David Taft - Atherton CA, US
Steven Bitler - Menlo Park CA, US
Qiang Zheng - Palo Alto CA, US
Adam Bell - San Francisco CA, US
Stelios Tzannis - Newark CA, US

International Classification:

A61K 47/32
A61K 38/02
A61K 31/136
A61K 31/519
A61K 31/5513

US Classification:

514 2, 5147726, 5147881, 514658, 51425941, 514220

Abstract:

Formulations of drugs and crystalline side chain polymers to provide controlled and/or sustained release drug formulations.

US Patent:

20090246155, Oct 1, 2009

Filed:

Jun 4, 2009

Appl. No.:

12/455628

Inventors:

Steven P. Bitler - Menlo Park CA, US
Qiang Zheng - Palo Alto CA, US
David Taft - Atherton CA, US

International Classification:

A61Q 17/04
A61K 8/00
A61Q 15/00
A61Q 1/06
A61Q 1/00
A61Q 5/00
A61Q 3/00
C11D 3/00

US Classification:

424 59, 424 65, 424 64, 424 63, 424 701, 424 61, 510108

Abstract:

Systems and methods for delivering personal care materials. Crystalline polymeric systems, referred to as CYC carriers, are associated with the cosmetic materials, through chemical bonding or through physical association. The crystallinity of the CYC carriers results from the presence of crystallizable side chains, for example long chain n-alkyl moieties, which results in relatively low and sharp melting temperatures. One class of CYC carriers, referred to as CYSC polymers, have a majority of the crystallizable side chains pendant from the polymer backbone. Another class of CYC carriers, referred to as ECC polymers, have a majority of the crystallizable side chains attached to terminal units of the polymer backbone. The ECC polymers can for example be obtained by modification of PLGA polymers. The CYC carriers in another class are non-polymeric. Some CYC carriers, referred to as CYC assemblies, have enhanced crystallinity as a result of the physical association of crystallizable moieties which are present in different types of molecule, for example between a polymer containing crystallizable moieties and a monomer containing crystallizable moieties. Preferably the CYC carrier is bioerodable.