Sandeep K Gupta

US Patent:

6355799, Mar 12, 2002

Filed:

Apr 27, 2000

Appl. No.:

09/530373

Inventors:

Sandeep Gupta - Concord OH
Shao-Yong Wu - Fremont CA
Masamitsu Tsukamoto - Mayfield Heights OH
David A. Pulman - Mentor OH

Assignee:

ISK Americas Incorporated - Concord OH

International Classification:

C07D23902

US Classification:

544309, 544311, 544312

Abstract:

Novel herbicidal and defoliant substituted aniline derived compounds represented by general structure (I) are described. W, X, Y, Z, and Q are as defined in the disclosure. Also described are the processes for the manufacture of these compounds and agriculturally suitable compositions containing these as active ingredients which are useful as herbicides for general or selective pre-emergent or post-emergent control of undesired plant species and defoliants at very low concentrations of these biologically active compounds.

US Patent:

6362698, Mar 26, 2002

Filed:

Sep 29, 2000

Appl. No.:

09/675973

Inventors:

Sandeep K. Gupta - Mountain View CA

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

H03B 512

US Classification:

331117FE, 331 34, 331167, 331117 R, 331185, 330 98, 330310

Abstract:

A circuit for conditioning an input control voltage signal that is used to drive an LC tank oscillator in a phase locked loop (PLL). The conditioning circuit includes a two-stage amplifier including a first stage amplifier connected to a second stage comprising an active cascode circuit, a diode-connected transistor and a resistor tied to a reference voltage (e. g. ground). The first stage amplifier receives a control voltage input signal, which would typically be produced at the output of a loop filter in a PLL, and produces a conditioned control voltage output signal at its output, which is connected to the drain of the diode-connected transistor. The purpose of the amplifier is to lower the impedance of the conditioned output signal, which is then used to drive the LC tank oscillator, wherein the series resistor acts both to lower the impedance and to act as the degenerating resistor for the diode-connected transistor. In addition, a clamping circuit comprising a second active cascode structure is provided to clamp the conditioned control voltage output signal such that it is prevented from falling below a predetermined value.

US Patent:

6369620, Apr 9, 2002

Filed:

Sep 29, 2000

Appl. No.:

09/672953

Inventors:

Sandeep K. Gupta - Mountain View CA

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

H03K 300

US Classification:

327108, 327 66, 327101, 330288

Abstract:

A cross coupled output stage for a transmitter. It is desirable to have high impedance for a differential cascode output stage of an externally terminated transmitter in order to improve return loss. However, at high frequencies, parasitic capacitances cause shunts at the output nodes due to drain to bulk capacitances and negative feedback loops due to gate-to-drain capacitance. In order to counteract this, cross coupled capacitors are connected to the circuit to cause a positive feedback loop. This counteracts the reduction in impedance causing the impedance to remain high over all frequencies and to improve the return loss.

US Patent:

6479435, Nov 12, 2002

Filed:

Feb 9, 2001

Appl. No.:

09/779674

Inventors:

David A. Pulman - Mentor OH
Shao-Yong Wu - Fremont CA
Sandeep Gupta - Concord OH
Hiroshi Shimoharada - Moriyama, JP
Masamitsu Tsukamoto - Mayfield Heights OH

Assignee:

ISK Americas Incorporated - Concord OH

International Classification:

C07D40312

US Classification:

504242, 544315, 544333

Abstract:

Diaryl ether compounds useful in the control of weeds are described. An exemplary compound is represented by the general formula (I): In this formula Q is represented by Q X and Y represent a hydrogen atom, halogen atom, cyano group, nitro group or (C )haloalkyl group; R is halogen; R and R represent a hydrogen atom, a (C )alkyl group or a (C )haloalkyl group. Methods of making the compounds are also described.

US Patent:

6529058, Mar 4, 2003

Filed:

Sep 21, 2001

Appl. No.:

09/956978

Inventors:

Sandeep Kumar Gupta - Mountain View CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03H 1126

US Classification:

327276

Abstract:

A circuit and method for obtaining a stable delay for a clock signal comprises a current source to generate a constant current having a first value; first and second current over capacitance (I/C) stages coupled to the current source and between a supply voltage and ground; and a capacitor, having a second value and coupled to a node formed by an output of the first I/C stage and an input of the second I/C stage. Application of a clock signal to an input of the first I/C stage produces an output at a logic gate coupled to an output of the second I/C stage. The output has a stable delay based on the first and second values. Additionally, the first and second values (i. e. , the value of the current or capacitance) can be changed to achieve a desired amount of the delay applied to the input clock signal.

US Patent:

6545161, Apr 8, 2003

Filed:

Aug 16, 2001

Appl. No.:

09/930149

Inventors:

Sandeep Gupta - Concord OH
Shao-Yong Wu - Fremont CA
Masamitsu Tsukamoto - Mayfield Heights OH
David A. Pulman - Mentor OH

Assignee:

Isk Americas Incorporated - Concord OH

International Classification:

C07D24808

US Classification:

5482632, 5482644, 504273, 504287

Abstract:

Novel herbicidal and defoliant substituted aniline derived compounds represented by general structure (I) are described. W, X, Y, Z, and Q are as defined in the disclosure. Also described are the processes for the manufacture of these compounds and agriculturally suitable compositions containing these as active ingredients which are useful as herbicides for general or selective pre-emergent or post-emergent control of undesired plant species and defoliants at very low concentrations of these biologically active compounds.

US Patent:

6573218, Jun 3, 2003

Filed:

Jul 5, 2001

Appl. No.:

09/786816

Inventors:

Masamitsu Tsukamoto - Mayfield Heights OH
Sandeep Gupta - Concord OH
Shao-Yong Wu - Fremont CA
David A. Pulman - Mentor OH

Assignee:

Ishihara Sangyo Kaisha, Ltd. - Osaka

International Classification:

C07D23116

US Classification:

504221, 504225, 544 51, 544 52, 544105

Abstract:

A compound of the formula (Ia): or its salts, in which the variables are as described in the disclosure; herbicidal compositions of said compounds, herbicidal processes using said compounds, defoliant processes using said compounds, and processes for preparing said compounds.

US Patent:

6613718, Sep 2, 2003

Filed:

Dec 5, 2001

Appl. No.:

10/001816

Inventors:

Sandeep Gupta - Concord OH
Masamitsu Tsukamoto - Mayfield Heights OH
Mark Read - Willoughby OH

Assignee:

Ishihara Sangyo Kaisha, Ltd. - Osaka

International Classification:

C07D23934

US Classification:

504242, 504243, 544309, 544317, 544180, 544182, 544224, 5483601, 5483561

Abstract:

Substituted aryl ether derived compounds represented by the general structure (I) are described. X and Y are independent of each other and are represented by hydrogen, halogen, cyano, nitro, (C )alkyl, (C )haloalkyl, or (C )haloalkoxy; Z is oxygen or sulfur; Q is selected form Q1 to Q6; A is oxygen, sulfur, or imino; R is hydrogen, (C )alkyl, (C )haloalkyl, or amino and can be independent of each other in a single molecule; R and R are independent of each other and may be selected from the group consisting of hydrogen, halogen, cyano, nitro, (C )alkyl, (C )haloalkyl, (C )alkenyl, (C )haloalkenyl and amino which may be optionally substituted with (C )alkyl or (C )haloalkyl; Ar is substituted or unsubstituted carbocyclic or heterocyclic aromatic ring being at least a five or six membered ring. This ring can be fused with another substituted or unsubstituted five or six membered carbocyclic or heterocyclic ring. When Q is Q5, unsubstituted or substituted phenyl is excluded.