David A Kramer

US Patent:

6603990, Aug 5, 2003

Filed:

Aug 10, 2001

Appl. No.:

09/925520

Inventors:

Weiguo Zhang - Foster City CA
David M. Kramer - Corte Madera CA

Assignee:

Toshiba America MRI, Inc. - Tustin CA

International Classification:

A61B 5055

US Classification:

600410, 600419, 382128, 382130, 324307, 324309

Abstract:

A magnetic resonance imaging (MRI) method is disclosed for generating and identifying water and fat separated MR images. Image data is first acquired to obtain two echo images with the water and fat signals orthogonal in the first echo image, and parallel/anti-parallel in the second echo image. The effect of background field inhomogeneties are removed, and water and fat images are separated from each other. The separated water and fat images are identified according to the difference of their precessing frequencies.

US Patent:

RE38532, Jun 8, 2004

Filed:

Dec 6, 1999

Appl. No.:

09/455515

Inventors:

John V. Heyse - Crockett CA
Bernard F. Mulaskey - Fairfax CA
Robert A. Innes - San Rafael CA
Daniel P. Hagewiesche - Oakland CA
William J. Cannella - Hercules CA
David C. Kramer - San Anselmo CA

Assignee:

Chevron Phillips Chemical Company LP - The Woodlands TX

International Classification:

C07C 412

US Classification:

585486, 585483, 585485, 585488, 585950, 518700, 518728, 423650, 423651

Abstract:

Carburization and metal-dusting while hydrodealkylating a hydrodealkylatable hydrocarbon are reduced even in the substantial absence of added sulfur.

US Patent:

6905593, Jun 14, 2005

Filed:

Sep 30, 2003

Appl. No.:

10/676897

Inventors:

Donald L. Kuehne - Hercules CA, US
Lisa P. Hawker - Oakland CA, US
David C. Kramer - San Anselmo CA, US

Assignee:

Chevron U.S.A. - San Ramon CA

International Classification:

C10G021/20

US Classification:

208251R, 208252, 208253

Abstract:

A calcium-containing hydrocarbonaceous material is treated with an aqueous mixture, comprising acetate ion and an alkaline material and having a pH in the range of 3. 0 to 5. 0, in order to extract at least a portion of the calcium from the hydrocarbonaceous material into the aqueous phase. Acetic acid is a suitable source of acetate ion. Ammonium hydroxide, sodium hydroxide and potassium hydroxide are example alkaline materials.

US Patent:

7083713, Aug 1, 2006

Filed:

Dec 23, 2003

Appl. No.:

10/744389

Inventors:

Susan M. Abernathy - Hercules CA, US
David C. Kramer - San Anselmo CA, US
John M. Rosenbaum - Richmond CA, US
Stephen J. Miller - San Francisco CA, US
Russell R. Krug - Novato CA, US

Assignee:

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

International Classification:

C10M 101/02
C10G 45/58
C10G 71/00

US Classification:

208 18, 208 19, 208 27, 208950, 508110, 508591, 585 1, 585 13, 518728

Abstract:

A composition of lubricating base oil having a weight percent of all molecules with at least one aromatic function less than 0. 30, a weight percent of all molecules with at least one cycloparaffin function greater than 10, and a ratio of weight percent of molecules with monocycloparaffins to weight percent of molecules with multicycloparaffins greater than 15.

US Patent:

7141157, Nov 28, 2006

Filed:

Mar 11, 2003

Appl. No.:

10/387211

Inventors:

John Rosenbaum - Richmond CA, US
David Kramer - San Anselmo CA, US
Joseph Pudlak - Vallejo CA, US

Assignee:

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

International Classification:

C10M 101/02
C10M 105/02

US Classification:

208 18, 208 19, 208950, 508110, 585 1, 585502

Abstract:

A process for preparing Fischer-Tropsch derived lubricating base oils by blending a Fischer-Tropsch distillate fraction having a viscosity of 2 or greater but less than 3 cSt at 100 degrees C. with a Fischer-Tropsch derived bottoms fraction; lubricating base oil compositions having a viscosity between about 3 and about 10 cSt at 100 degrees C. and a TGA Noack volatility of less than about 45 weight percent; and finished lubricants using the aforesaid lubricating base oils.

US Patent:

7144497, Dec 5, 2006

Filed:

Nov 20, 2002

Appl. No.:

10/301391

Inventors:

Brent K. Lok - San Francisco CA, US
David Kramer - San Anselmo CA, US
John M. Rosenbaum - Richmond CA, US
Joseph Pudlak - Vallejo CA, US

Assignee:

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

International Classification:

C10M 105/02
C10G 71/00

US Classification:

208 18, 208 19, 585 1, 585 2

Abstract:

A process for producing a lubricating base oil blend which comprises (a) recovering a Fischer-Tropsch derived distillate fraction characterized by a kinematic viscosity of about 2 cSt or greater but less than 3 cSt at 100 degrees C. ; and (b) blending the Fischer-Tropsch derived distillate fraction with a petroleum derived base oil selected from the group consisting of a Group I base oil, a Group II base oil, a Group III base oil, and a mixture of two or more of any of the foregoing conventional base oils in the proper proportion to produce a lubricating base oil blend characterized as having a viscosity of about 3 or greater; also the base oil blends, finished lubricants, and their use in internal combustion engines.

US Patent:

7195706, Mar 27, 2007

Filed:

Dec 23, 2003

Appl. No.:

10/743932

Inventors:

Susan M. Abernathy - Hercules CA, US
David C. Kramer - San Anselmo CA, US
John M. Rosenbaum - Richmond CA, US
Stephen J. Miller - San Francisco CA, US
Russell R. Krug - Novato CA, US
James N. Ziemer - Martinez CA, US
Robert J. Farina - Richmond CA, US
Mark L. Sztenderowicz - San Francisco CA, US

Assignee:

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

International Classification:

C10G 73/38
C10G 71/00
C10M 101/00

US Classification:

208 18, 208 19, 208 27, 208 97, 208950

Abstract:

A process for manufacturing a finished lubricant by: a) performing Fischer-Tropsch synthesis on syngas to provide a product stream; b) isolating from said product stream a substantially paraffinic wax feed having less than about 30 ppm total nitrogen and sulfur, and less than about 1 wt % oxygen; c) dewaxing said feed by hydroisomerization dewaxing using a shape selective intermediate pore size molecular sieve comprising a noble metal hydrogenation component, wherein the hydroisomerization temperature is between about 600 F. (315 C. ) and about 750 F. (399 C. ), to produce an isomerized oil; and d) hydrofinishing said isomerized oil, whereby a lubricating base oil is produced having specific desired properties; and e) blending the lubricating base oil with at least one lubricant additive.

US Patent:

7218110, May 15, 2007

Filed:

Sep 2, 2005

Appl. No.:

11/217405

Inventors:

Weiguo Zhang - Foster City CA, US
David M. Kramer - Corte Madera CA, US

Assignee:

Toshiba America MRI, Inc. - Tustin CA

International Classification:

G01V 3/00

US Classification:

324309, 324307

Abstract:

A method and a system for acquiring diffusion magnetic resonance images with compensation of the effects of eddy currents induced by the diffusion weighting (DW) gradient pulses. Prescan data are first acquired using the same DW sequence to be used for imaging. The prescan data are used to obtain eddy current parameters that model the effects of DW-induced eddy currents under the exact conditions under which DW images are to be acquired. The DW imaging sequence is then slightly modified according to the eddy current parameters and used to acquire DW image data with the effects of DW-induced eddy currents compensated.