Joseph Tran

US Patent:

7211192, May 1, 2007

Filed:

Mar 29, 2002

Appl. No.:

10/112573

Inventors:

Kenneth J. Shea - Irvine CA, US
Stephen T. Hobson - Gunpowder MD, US
Joseph Tran - San Diego CA, US

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

B01D 11/00

US Classification:

210634, 210640, 210660, 210690

Abstract:

The present invention relates generally to hybrid organic-inorganic adsorbents for decontamination of fluids. Bridged poysilsesquioxanes are a family of hybrid organic-inorganic materials prepared by sol-gel processing of monomers that contain a variable organic bridging group and two or more trifunctional silyl groups. Specifically, the present invention relates to dipropylenedisulfide-co-phenylene-bridged polysilsesquioxane compositions, methods of making dipropylenedisulfide-co-phenylene-bridged polysilsesquioxanes, and methods of use of dipropylenedisulfide-co-phenylene-bridged polysilsesquioxanes. The present invention discloses properties of dipropylenedisulfide-co-phenylene-bridged polysilsesquioxanes that include high ligand loading, increased surface area, and increased porosity. These properties make dipropylenedisulfide-co-phenylene-bridged polysilsesquioxanes excellent adsorbents for decontamination of fluids for use in environmental and industrial processes.

US Patent:

20070203341, Aug 30, 2007

Filed:

Apr 26, 2007

Appl. No.:

11/740804

Inventors:

Kenneth Shea - Irvine CA, US
Stephen Hobson - Gunpowder MD, US
Joseph Tran - San Diego CA, US

International Classification:

C07F 7/02
C07D 307/02
C07D 333/02

US Classification:

546014000, 549029000, 549429000, 556433000

Abstract:

The present invention relates generally to hybrid organic-inorganic adsorbents for decontamination of fluids. Bridged poysilsesquioxanes are a family of hybrid organic-inorganic materials prepared by sol-gel processing of monomers that contain a variable organic bridging group and two or more trifunctional silyl groups. Specifically, the present invention relates to dipropylenedisulfide-co-phenylene-bridged polysilsesquioxane compositions, methods of making dipropylenedisulfide-co-phenylene-bridged polysilsesquioxanes, and methods of use of dipropylenedisulfide-co-phenylene-bridged polysilsesquioxanes. The present invention discloses properties of dipropylenedisulfide-co-phenylene-bridged polysilsesquioxanes that include high ligand loading, increased surface area, and increased porosity. These properties make dipropylenedisulfide-co-phenylene-bridged polysilsesquioxanes excellent adsorbents for decontamination of fluids for use in environmental and industrial processes.

US Patent:

55307027, Jun 25, 1996

Filed:

May 31, 1994

Appl. No.:

8/251522

Inventors:

John P. Palmer - Pomona CA
Anaikuppam Marudarajan - San Dimas CA
Joseph Tran - West Covina CA

International Classification:

H04J 316

US Classification:

370 853

Abstract:

A system and method for storage and communication of information between at least one first information containing terminal and a second terminal. The system and method includes generating a random number within the first terminal in response to receipt of a begin signal from the second terminal, and comparing the random number to a count incremented and maintained by a digital counter within the first terminal. When the random number is equal to the count, the first terminal transmits a request to transmit signal to the second terminal. If the second terminal responds with a first acknowledgment, the first terminal then sends an information containing signal to the second terminal. If the information containing signal is correctly received, the second terminal responds by transmitting a second acknowledgment which is received by the first terminal.

US Patent:

60382554, Mar 14, 2000

Filed:

Jun 24, 1997

Appl. No.:

8/881629

Inventors:

John P. Palmer - Pomona CA
Mohammad A. Asgari - San Diego CA
Joseph Tran - West Covina CA

Assignee:

Ludwig Kipp - Palm Beach FL

International Classification:

H03K 708
H03K 908

US Classification:

375238

Abstract:

In a receiver, a system and method are disclosed for providing improved detection of data from a transmitted sequence of pulse width modulated (PWM) pulses. The disclosed system includes a pulse detector having an adjustable critical duty cycle for distinguishing between first and second pulses based upon their respective long and short duty cycles at which they are received. The disclosed system further includes an element which determines the duty cycle of the received pulses and an element which adjusts the critical duty cycle based on the duty cycle which is so determined. The duty cycle may be determined by determining the correspondence between information obtained from an initial pulse sequence and reference information at the receiver. In the disclosed method, the duty cycle of pulses in an initial sequence is first determined and then checked against a predetermined limit. If the duty cycle falls outside the limit, the critical duty cycle is adjusted prior to further pulses being detected.