Patents Assigned to Stevens Institute of Technology
  • Patent number: 5993056
    Abstract: A method is provided for recovery of lost cells in an ATM network wherein an error recovery scheme is incorporated into the ATM adaptation layer to allow recovery of cells along the network.
    Type: Grant
    Filed: July 28, 1997
    Date of Patent: November 30, 1999
    Assignee: Stevens Institute of Technology
    Inventors: Dhadesugoor R. Vaman, Cadathur V. Chakravarthy, Kicheon Hong
  • Patent number: 5974881
    Abstract: A device which employs an acoustic signal having one or more frequencies for penetrating into ground, water, or sediments and vibrating a compliant buried object is provided. When these acoustic signals encounter an acoustically compliant object such as a mine, the acoustic signals vibrate the compliant object, leading to a vibration of the compliant object against the boundaries of the surrounding medium such as ground sediment, creating a nonlinear distortion of the probing signal including the generation of harmonics and acoustic waves with combination frequencies (nonlinear signals). These nonlinear vibrating signals are received from the surface by a sensor. The amplitude of the measured nonlinear signals indicates the presence of an acoustically compliant object such as a mine.
    Type: Grant
    Filed: July 16, 1997
    Date of Patent: November 2, 1999
    Assignee: The Trustees of the Stevens Institute of Technology
    Inventors: Dimitri M. Donskoy, Alexander M. Sutin
  • Patent number: 5895364
    Abstract: The present invention provides an apparatus for noninvasive determination of bone mass, said apparatus having a platform for supporting a bone to be measured, a spring having a selected stiffness which connects the platform to a sensor capable of measuring vibration velocity and force, and a vibrating means connected to the sensor, wherein the vibrating means exposes the sensor, the spring and the platform to vibration so that vibration velocity and force can be measured by the sensor and the mass of the bone determined. A second apparatus for noninvasive determination of bone mass having a gripping means, a spring having a selected stiffness which connects the gripping means to a platform for positioning of a bone, a sensor capable of measuring vibration velocity and force which connects the platform to a vibrating means, and a vibrating means which vibrates the sensor, the platform, the spring, and the gripping means so the vibration velocity and force can be measured by the sensor is also provided.
    Type: Grant
    Filed: November 25, 1997
    Date of Patent: April 20, 1999
    Assignee: The Trustees of Stevens Institute of Technology
    Inventor: Dimitri Donskoy
  • Patent number: 5872426
    Abstract: A method and apparatus for stabilizing glow plasma discharges by suppressing the transition from glow-to-arc includes a perforated dielectric plate having an upper surface and a lower surface and a plurality of holes extending therethrough. The perforated dielectric plate is positioned over the cathode. Each of the holes acts as a separate active current limiting micro-channel that prevents the overall current density from increasing above the threshold for the glow-to-arc transition. This allows for a stable glow discharge to be maintained for a wide range of operating pressures (up to atmospheric pressures) and in a wide range of electric fields include DC and RF fields of varying strength.
    Type: Grant
    Filed: March 18, 1997
    Date of Patent: February 16, 1999
    Assignee: Stevens Institute of Technology
    Inventors: Erich E. Kunhardt, Kurt H. Becker
  • Patent number: 5858385
    Abstract: A novel controlled release device employing microporous membranes with or without a nonporous coating and aqueous-organic partitioning of the bioreactive substances to be delivered is provided. Devices and methods for delivering pharmaceuticals, pest-control substances, hormones, nutrients and fragrances to humans, animals or any environment are also provided.
    Type: Grant
    Filed: July 21, 1997
    Date of Patent: January 12, 1999
    Assignee: The Trustees of the Stevens Institute of Technology
    Inventors: Kamalesh K. Sirkar, Stephanie Farrell, Rahul Basu
  • Patent number: 5822206
    Abstract: A computer-based engineering design system to design a part, a tool to make the part, and the process to make the part. The design system has a processor and a memory. The memory stores feature templates, each feature template being a representation of a primitive object having a form and a function. Each feature template is indexed by the function of the primitive object and includes a representation of a primitive geometric entity having the form of the primitive object. Each feature template can include information relating to a tool to make the primitive object and a process to make the primitive object. The design system also includes an input device for receiving a request to design the part. This request includes one or more predetermined functions that the part performs.
    Type: Grant
    Filed: August 30, 1996
    Date of Patent: October 13, 1998
    Assignee: The Trustees of the Stevens Institute of Technology
    Inventors: Donald Sebastian, Steven Pratt, Sivakumar Muthuswamy, David Johann Kniep, Souran Manoochehri, Scott Kolodzieski
  • Patent number: 5636035
    Abstract: A method and apparatus for conducting laser absorption spectroscopy uses a frequency tunable laser aligned to pass a laser beam through a sample volume and to an optical detector. A two-step modulation is used to generate frequency components that may be used to both lock the tunable laser to the absorbance signal, and generate an output signal proportional to the absorbance signal. The method includes frequency modulating the tunable laser at a first frequency while further modulating the tunable laser with a triangular waveform having a second frequency, and generating a feedback control signal based upon an antisymmetrical signal demodulated from the optical detector using a first predetermined harmonic of the second frequency. The tunable laser is locked to the absorbance signal with the feedback control signal. An output signal proportional to the absorbance signal is generated using a symmetrical signal demodulated using a second predetermined harmonic of the second or triangular waveform frequency.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: June 3, 1997
    Assignee: The Trustees of the Stevens Institute of Technology
    Inventors: Edward A. Whittaker, Hoi C. Sun
  • Patent number: 5629199
    Abstract: A method for removing chemical preservatives from wood treated with chemical preservatives is provided. Wood treated with chemical preservatives is chipped to produce wood chips. These wood chips are contacted with an organic solvent and sonicated to extract the chemical preservatives. A system for the removal of chemical preservatives from wood treated with these preservatives which contains an extraction system for contacting wood chips from wood treated with a chemical preservative with an organic solvent and a sonicator for sonicating these wood chips in the organic solvent are also provided.
    Type: Grant
    Filed: March 15, 1996
    Date of Patent: May 13, 1997
    Assignee: Trustees of Stevens Institute of Technology
    Inventors: George Korfiatis, Nirupam Pal
  • Patent number: 5552995
    Abstract: A computer-based engineering design system to design a part, a tool to make the part, and the process to make the part. The design system has a processor and a memory. The memory stores feature templates, each feature template being a representation of a primitive object having a form and a function. Each feature template is indexed by the function of the primitive object and includes a representation of a primitive geometric entity having the form of the primitive object. Each feature template can include information relating to a tool to make the primitive object and a process to make the primitive object. The design system also includes an input device for receiving a request to design the part. This request includes one or more predetermined functions that the part performs.
    Type: Grant
    Filed: November 24, 1993
    Date of Patent: September 3, 1996
    Assignee: The Trustees of the Stevens Institute of Technology
    Inventor: Donald H. Sebastian
  • Patent number: 5391929
    Abstract: The method of power transmission and distribution aims to mitigate the magnetic fields generated at a right of way and at distances which extend beyond the right of way. The transmission and distribution lines use various line parameters including the relative locations of the conductors around the axis of symmetry of the right of way, the current magnitudes and the phase angles of the currents flowing in the conductors in optimum asymmetric fashion. The use of magnetic field mitigation bodies placed adjacent to the current bearing conductors increases the scope and the effectiveness of the mitigation. A mitigation technique is also provided for mitigating the magnetic field generated by current bearing sources used in power distribution, with unknown or difficult to characterize current distributions, such as transformers.
    Type: Grant
    Filed: May 17, 1993
    Date of Patent: February 21, 1995
    Assignee: Stevens Institute of Technology
    Inventors: Dilhan M. Kalyon, Halit S. Gokturk, Sudhir B. Railkar
  • Patent number: 5365115
    Abstract: A method and apparatus for mitigation of magnetic fields from magnetic field sources operating at low frequencies, typically less than 100 KHZ, are provided. The method is based on placing magnetic bodies of proper shape, size and physical properties close to the source of the magnetic field to cancel or reduce the magnetic field at desired sites, located away from the source. The method is applicable to mitigating all sources of magnetic fields including those generated by electric power lines, transformers, various tools, electronic devices and appliances. The apparatus, an application of the method to electric power transmission lines, consists of body of magnetic material disposed adjacent to at least one conductor of a multi-line electric power transmission system.
    Type: Grant
    Filed: June 23, 1992
    Date of Patent: November 15, 1994
    Assignee: Stevens Institute of Technology
    Inventors: Dilhan M. Kalyon, Halit S. Gokturk, Sudhir B. Railkar
  • Patent number: 5053132
    Abstract: An asymmetrically-wettable, porous membrane has a hydrophilic side and a hydrophobic side. The membrane has pores which pass through the membrane to provide communication between the hydrophilic side and the hydrophobic side. The membrane can be used in a process for transferring a solute from a liquid feed solution to a liquid extractant which is substantially immiscible with the feed solution. The process comprises contacting the hydrophilic side of the membrane with one solution and contacting the hydrophobic side of the membrane with the other solution. The interface between the feed solution and the extractant is substantially immobilized at the porous membrane. Solute is transferred from the feed solution to the extractant through the pores of the membrane.
    Type: Grant
    Filed: October 10, 1989
    Date of Patent: October 1, 1991
    Assignee: The Trustees of the Stevens Institute of Technology
    Inventor: Kamalesh K. Sirkar
  • Patent number: 4997569
    Abstract: In a process for transferring solute from a liquid feed solution to a liquid extractant which is substantially immiscible with the feed solution, one side of a porous membrane is contacted with the feed solution and the other side of the membrane with the extractant. One of the feed solution or the extractant preferentially wets the porous membrane. An interface-immobilizing pressure difference is maintained across the porous membrane in a direction and of a magnitude effective to oppose the tendency of the liquid which preferentially wets the membrane to flow through the membrane and disperse in the liquid on the opposite side. The interface between the feed solution and the extractant is thereby immobilized at the porous membrane.
    Type: Grant
    Filed: February 6, 1989
    Date of Patent: March 5, 1991
    Assignee: The Trustees of the Stevens Institute of Technology
    Inventor: Kamalesh K. Sirkar
  • Patent number: 4921612
    Abstract: An asymmetrically-wettable, porous membrane has a hydrophilic side and a hydrophobic side. The membrane has pores which pass through the membrane to provide communication between the hydrophilic side and the hydrophobic side. The membrane can be used in a process for transferring a solute from a liquid feed solution to a liquid extractant which is substantially immiscible with the feed solution. The process comprises contacting the hydrophilic side of the membrane with one solution and contacting the hydrophobic side of the membrane with the other solution. The interface between the feed solution and the extractant is substantially immobilized at the porous membrane. Solute is transferred from the feed solution to the extractant through the pores of the membrane.
    Type: Grant
    Filed: June 15, 1988
    Date of Patent: May 1, 1990
    Assignee: The Trustees of Stevens Institute of Technology
    Inventor: Kamalesh K. Sirkar
  • Patent number: 4789468
    Abstract: An immobilized-interface solute-transfer unit for transferring solute from a feed solution to an extractant liquid comprises a fluid-tight housing and a porous membrane which divides the housing into a feed solution chamber and an extractant chamber. The housing has feed solution inlet and outlet ports which communicate with the feed solution chamber, and extractant inlet an outlet ports which communicate with the extractant chamber. The solute-transfer unit also includes a presure difference controller for maintaining a difference between a liquid pressure of a feed solution in the feed solution chamber and a liquid presure of an extractant in the extractant chamber substantially within a predetermined pressure range so that an interface between the feed solution and the extractant is substantially immobilized at the membrane.
    Type: Grant
    Filed: August 28, 1984
    Date of Patent: December 6, 1988
    Assignee: The Trustees of the Stevens Institute of Technology
    Inventor: Kamalesh K. Sirkar
  • Patent number: 4785472
    Abstract: A remote teaching system 2 includes a teacher station 4 and a plurality of student stations 6 which may be located at sites remote from one another. Each station 4, 6 includes a speaker telephone 122, 122' or other voice telephone set which is connectable to a telephone system 124 for voice communication among the various stations. Each station 4, 6 includes a video display monitor 14, 14' such as a television set and a video media player 16, 16' such as a video-tape cassette player connected to the video display monitor 14, 14'. Each student station 6 also includes a video-media-player controller 8', 22' which is connected to the video media player 16' of the student station 6 for controlling the playing of the player. The teacher station 4 includes a video-media-player master controller 8, 22 connected to the video media player 16 of the teacher station 4 for controlling the playing of the player.
    Type: Grant
    Filed: May 11, 1987
    Date of Patent: November 15, 1988
    Assignee: The Trustees of the Stevens Institute of Technology
    Inventor: Arthur Shapiro
  • Patent number: 4783595
    Abstract: A source (100, 101, 200, 300, 400) of a beam of positive ions or atoms comprises an ion-emission pellet (1, 401) consisting essentially of a solid electrolyte. Preferred solid electrolytes for the pellet (10, 49) are alkali or alkali-earth mordenites. A pellet heater is capable of heating the pellet (1, 401) to an ion-emission temperature at which ions are emitted from the pellet. A beam-forming electrode (2, 4, 31, 60) contacts an ion-emission surface (22) of the pellet (1, 401). The beat-forming electrode (2, 4,31, 60) has at least one passageway extending through it into which ions from the ion-emission surface (22) can pass. Ions emitted into the passageway are discharged from the source as unneutralized ions or neutralized atoms.
    Type: Grant
    Filed: March 28, 1985
    Date of Patent: November 8, 1988
    Assignee: The Trustees of the Stevens Institute of Technology
    Inventor: Milos Seidl
  • Patent number: 4750918
    Abstract: A permeant gas is selectively transferred from a feed-gas mixture which comprises the permeant gas and at least one other component to an output fluid by the process of the invention. The process involves introducing a selective-permeation liquid into a permeation-transfer chamber. A gas-depletion channel and a gas-enrichment channel pass through the permeation chamber and are separated from the chamber respectively by porous walls. The selective-permeation liquid contacts the porous walls but does not flow into the gas-depletion or gas-enrichment channels. The feed-gas mixture is introduced into the gas-depletion channel so that permeant gas in the mixture can pass through the pores of the walls of the channel into the selective-permeation liquid and from the selective-permeation liquid through the pores of the walls of the gas-enrichment channel into the gas-enrichment channel.
    Type: Grant
    Filed: May 28, 1985
    Date of Patent: June 14, 1988
    Assignee: The Trustees of the Stevens Institute of Technology
    Inventor: Kamalesh K. Sirkar
  • Patent number: RE34828
    Abstract: An immobilized-interface solute-transfer unit for transferring solute from a feed solution to an extractant liquid comprises a fluid-tight housing and a porous membrane which divides the housing into a feed solution chamber and an extractant chamber. The housing has feed solution inlet and outlet ports which communicate with the feed solution chamber, and extractant inlet an outlet ports which communicate with the extractant chamber. The solute-transfer unit also includes a pressure difference controller for maintaining a difference between a liquid pressure of a feed solution in the feed solution chamber and a liquid pressure of an extractant in the extractant chamber substantially within a predetermined pressure range so that an interface between the feed solution and the extractant is substantially immobilized at the membrane.
    Type: Grant
    Filed: October 24, 1991
    Date of Patent: January 17, 1995
    Assignee: The Trustees of the Stevens Institute of Technology
    Inventor: Kamalesh Sirkar