Ravi Raj Gupta

US Patent:

7803867, Sep 28, 2010

Filed:

Apr 13, 2006

Appl. No.:

11/403723

Inventors:

Kevin Hanrahan - Wayne PA, US
Kurt Wood - Abington PA, US
Lotfi Hedhli - King of Prussia PA, US
Ravi Gupta - Norristown PA, US
Wayne Skilton - Jenkintown PA, US

Assignee:

Arkema Inc. - Philadelphia PA

International Classification:

D06M 15/277

US Classification:

524544, 428421, 525199, 525222, 5253262

Abstract:

The invention relates to an aqueous-based fluoropolymer coating that is especially useful for use over flat or low-slope flexible surfaces, and more specifically for flat or low-slope roofing. The coating can be factory or field applied. The coating offers the advantages of improved durability, lower dirt pick-up, stain resistance, water repellency, increased solar reflectivity duration, and mildew resistance.

US Patent:

8263695, Sep 11, 2012

Filed:

Dec 20, 2006

Appl. No.:

12/158439

Inventors:

Lawrence H. Judovits - Collegeville PA, US
Nicholas J. Rodak - Princeton NJ, US
Saeid Zerafati - Villanova PA, US
Ravi R. Gupta - Pottstown PA, US

Assignee:

Arkema Inc. - King of Prussia PA

International Classification:

C08K 3/34

US Classification:

524445, 526255

Abstract:

The invention relates to compositions of polyvinylidene fluoride (PVDF) and its copolymers that have been modified with an onium salt. The PVDF compositions exhibit an increased melting point, a reduced heat distortion and piezo properties. The improved properties can be further enhanced through annealing, and/or the addition of nanoclays. Additionally, the combination of PVDF, nanoclays and annealing can also produce a PVDF with an increased melting point and piezoelectric properties.

US Patent:

20100304270, Dec 2, 2010

Filed:

May 27, 2010

Appl. No.:

12/788427

Inventors:

Ramin AMIN-SANAYEI - Collegeville PA, US
Ravi R. Gupta - Pottstown PA, US

Assignee:

Arkema Inc. - Philadelphia PA

International Classification:

H01M 8/10
H01M 4/02
H01M 4/04
H01M 8/00
H01B 1/20
H01G 9/042

US Classification:

429483, 429209, 427 58, 25251933, 361508, 361528

Abstract:

The invention relates to an aqueous fluoropolymer, and preferably polyvinylidene fluoride (PVDF), composition for manufacturing electrodes for use in non-aqueous-type electrochemical devices, such as batteries and electric double layer capacitors. The composition contains aqueous PVDF binder, and one or more powdery electrode-forming materials. In one embodiment, the composition is free of fluorinated surfactant In another embodiment, one or more fugitive adhesion promoters are added. The electrode formed from the composition of the invention exhibits interconnectivity and irreversibility that is achieved from the use of aqueous PVDF binder.

US Patent:

20110250435, Oct 13, 2011

Filed:

Oct 9, 2009

Appl. No.:

13/126374

Inventors:

Jiaxin Jason Ge - Lower Providence PA, US
Michael T. Burchill - Langhorne PA, US
Ravi R. Gupta - Pottstown PA, US
Scott Gaboury - Blue Bell PA, US

International Classification:

B32B 5/16
B05D 5/06
B82Y 99/00

US Classification:

428323, 427162, 977773

Abstract:

The invention relates to a thin, nano-structured coating that provides optical light efficiency enhancement. The dried coating contains nano-structures that provide a very low haze level of less than 2 percent, and a light transmission improvement of at least 1% over the non-coated substrate. For the nano-structured coating on an acrylic substrate the transmission is greater than 93 percent, and preferably greater than 94 percent. The coatings of the invention are especially useful for optical electronic displays and photovoltaic modules.

US Patent:

20120024353, Feb 2, 2012

Filed:

Mar 1, 2010

Appl. No.:

13/254101

Inventors:

Jiaxin Jason Ge - Lover Providence PA, US
Michael T. Burchill - Langhorne PA, US
Ravi R. Gupta - Pottstown PA, US
Steven B. Lacock - Boyertown PA, US
Mark A. Aubart - West Chester PA, US
Robert A. Wanat - Langhorne PA, US

Assignee:

Arkema France - Colombes

International Classification:

H01L 31/048

US Classification:

136251

Abstract:

The invention relates to high Tg monolithic and multi-layer thermoformable film or sheet useful as a backsheet on a photovoltaic module (PV). A methacrylic-based material is preferred. The film or sheet is formed of a composition having a Tg greater than 110 C. The methacrylic composition may be a blend of a polymethyl methacrylate polymer and a miscible or semi-miscible high Tg polymer, or may be a copolymer containing primarily methyl methacrylate monomer units. The backsheet is optionally covered with a fluoropolymer or acrylic/fiuoropolymer covering on the outside (side facing the environment). The back-sheet can be clear, white, and/or pigmented. The film or sheet is especially useful in concentrating photovoltaic modules (CPV), and is also useful in thin film photovoltaic modules.