Ramesh K Gupta

US Patent:

7282138, Oct 16, 2007

Filed:

Sep 10, 2004

Appl. No.:

10/938301

Inventors:

Edward S. Ellis - Falls Church VA, US
Ramesh Gupta - Berkeley Heights NJ, US
William J. Novak - Great Falls VA, US

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

C10G 69/02

US Classification:

208 89, 208 27

Abstract:

A distillate fuel feed is hydrotreated to remove heteroatoms and then separated into light and heavy hydrotreated fractions, with the heavy fraction catalytically dewaxed to improve low temperature properties. The hydrotreating and dewaxing are conducted in separate stages, which may be in the same reactor vessel. Fresh hydrogen may be passed into the dewaxing stage, with the dewaxing stage gaseous effluent then passed into the hydrotreating stage to provide hydrogen for the hydrotreating. Existing hydrotreating reaction vessels and facilities may be retrofitted to add one or more dewaxing stages.

US Patent:

20050232834, Oct 20, 2005

Filed:

Feb 1, 2005

Appl. No.:

11/047865

Inventors:

Tahmid Mizan - Centreville VA, US
Ramesh Gupta - Berkeley Heights NJ, US

International Classification:

B01J008/02

US Classification:

422220000, 422211000, 422217000

Abstract:

This invention relates to reactors with mitigation of fouling-related pressure buildup, the reactors having a reactor bed containing at least one catalyst layer through which reactants flow. The mitigation of fouling which occurs at the top of the reactor bed is accomplished by using at least one blowback ring located near the top of the reactor bed.

US Patent:

20100170830, Jul 8, 2010

Filed:

Mar 16, 2010

Appl. No.:

12/661353

Inventors:

Tahmid I. Mizan - Centreville VA, US
Ramesh Gupta - Berkeley Heights NJ, US

International Classification:

C10G 75/04

US Classification:

208 48AA

Abstract:

This invention relates to reactors with mitigation of fouling-related pressure buildup, the reactors having a reactor bed containing at least one catalyst layer through which reactants flow. The mitigation of fouling which occurs at the top of the reactor bed is accomplished by using at least one blowback ring located near the top of the reactor bed.

US Patent:

52203204, Jun 15, 1993

Filed:

Feb 10, 1992

Appl. No.:

7/831731

Inventors:

Francois T. Assal - Bethesda MD
John V. Evans - Gaithersburg MD
Christoph E. Mahle - Washington DC
Amir I. Zaghloul - Bethesda MD
Ramesh K. Gupta - Rockville MD

Assignee:

COMSAT - Washington DC

International Classification:

H04B 100

US Classification:

34082579

Abstract:

A "modified rearrangeable" switch matrix combines both. beta. switching elements and crossbar switch matrices in a single switch configuration, with. beta. switching elements used at the input and output and at least one crossbar switch matrix in the middle to receive its inputs from. beta. switching elements and provide its outputs to. beta. switching elements.

US Patent:

49318020, Jun 5, 1990

Filed:

Mar 11, 1988

Appl. No.:

7/167287

Inventors:

Francois T. Assal - Bethesda MD
John V. Evans - Gaithersburg MD
Christoph E. Mahle - Washington DC
Amir I. Zaghloul - Bethesda MD
Ramesh K. Gupta - Rockville MD

Assignee:

Communications Satellite Corporation

International Classification:

H04B 719

US Classification:

342356

Abstract:

On-board satellite switching is performed in three stages, an outer stage of switching on the up-link side for routing the received signals to either demodulators or frequency translators, a first inner stage of switching, preferably a baseband switch and processor, for routing and processing the outputs of the demodulators, a second inner stage of switching, e. g. , a microwave switch matrix, for routing the outputs of the frequency translators, and an outer stage on the down-link side for assembling and routing the down-link spot beams. For a multiple hopping-beam system, the outer stages are microwave switch matrices, and for a hybrid scanning-hopping system the outer stages are beam forming matrices. A general purpose modified rearrangeable switch matrix is also disclosed.

US Patent:

56964706, Dec 9, 1997

Filed:

Jun 7, 1995

Appl. No.:

8/483763

Inventors:

Ramesh Kumar Gupta - Rockville MD
Chunming Chen - Germantown MD
Francois Tavi Assal - Bethesda MD

Assignee:

Comsat Corporation - Bethesda MD

International Classification:

H01P 115

US Classification:

333103

Abstract:

Highly reliable, light-weight, and low power-consuming microwave redundancy and re-routing electronic switches suitable for on-board satellite applications permit rearranging of communication paths for up- and down-link communications and re-routing of microwave signals to redundant devices in the event of on-board hardware failures.

US Patent:

49789325, Dec 18, 1990

Filed:

Jul 7, 1988

Appl. No.:

7/216921

Inventors:

Ramesh K. Gupta - Rockville MD
Bernard D. Geller - Rockville MD

Assignee:

Communications Satellite Corporation - Clarksburg MD

International Classification:

H01P 122

US Classification:

333 81R

Abstract:

An attenuator element has a reference path and a relative attenuation path. The reference path is formed by a T-network of two FETs operated in the passive mode and a shunt path and the attenuation path is formed with a similar structure, with the FETs in the shunt path having a different channel width. Instead of a T-network, a Pi-network of transistors can be used. The respective gates of the FETs along the reference path are connected to a first control input corresponding to either zero volts or the pinch-off voltage and the respective gates of the transistors on the attenuation path are connected to a complementary control input having a voltage corresponding to the other of zero volts and the pinch-off voltage. Another type of attenuator element is formed with a reference path having a transmission line and an attenuation path formed by a resistive T-network, with the attenuation and reference paths being alternately selectable by two single pole, double throw switches. The switches can also be formed by FETs operated in the passive mode, and be controlled by a control signals corresponding to either zero volts or the pinch-off voltage.

US Patent:

20220235531, Jul 28, 2022

Filed:

Nov 20, 2020

Appl. No.:

17/637751

Inventors:

Ramesh Chandra Gupta - Ashburn VA, US

International Classification:

E02D 5/66
E02D 7/06
E02D 27/16
E02D 27/34

Abstract:

The rapid consolidation and compaction method comprises (i) first driving a hollow pipe, (ii) driving a pipe with a removable end plate after filling and compacting the sandy material in it, through the hollow pipe, to required depth, creating high excess pore-water pressures in the range of 50 to 300 KPa in clayey soils, (iv) pulling out the pipe section leaving behind the removable end plate and thereby installing porous displacement piles which allows dissipation of the excess pore-water pressures horizontally to the porous displacement pile, in which the excess water flows out vertically to the ground surface, and (v) the length of the drainage path is reduced to half the spacing between adjoining porous displacement piles, allowing rapid consolidation resulting in increase in density. Installing the porous displacement piles in the layer of loose to medium dense sand layer results in the instantaneous increase in its density.