Patents by Inventor Louis Abrahams

Louis Abrahams has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5393434
    Abstract: A liquid chromatography system including a liquid pump having a pumping chamber, an inlet port, an outlet port, and a purge port, all communicating with the pumping chamber; a separation column; an outlet valve connected between the outlet port and the separation column and adapted to control liquid flow therebetween; a source of mobile phase; an inlet valve connected between the inlet port and the source and adapted to control liquid flow therebetween; and a purge valve connected to the purge port.
    Type: Grant
    Filed: November 22, 1993
    Date of Patent: February 28, 1995
    Assignee: Zymark Corporation
    Inventors: Burleigh M. Hutchins, Raymond R. Dunlap, Timothy J. Conklin, Bruce A. Swanson, John Petracca, Louis Abrahams, Ronald A. Kimball
  • Patent number: 5393420
    Abstract: A liquid chromatography system including a liquid pump having a pumping chamber, an inlet port, an outlet port, and a purge port, all communicating with the pumping chamber; a separation column; an outlet valve connected between the outlet port and the separation column and adapted to control liquid flow therebetween; a source of mobile phase; an inlet valve connected between the inlet port and the source and adapted to control liquid flow therebetween; and a purge valve connected to the purge port.
    Type: Grant
    Filed: November 23, 1993
    Date of Patent: February 28, 1995
    Assignee: Zymark Corporation
    Inventors: Burleigh M. Hutchins, Raymond R. Dunlap, Timothy J. Conklin, Bruce A. Swanson, John Petracca, Louis Abrahams, Ronald A. Kimball
  • Patent number: 5045047
    Abstract: A centrifuge apparatus including a rotor; a drive coupled to the rotor; an inner ring adapted to pivotally support an annular array of inner containers having open upper ends; an inner coupling coupled between the rotor and the inner ring so as to cause rotation thereof and resultant centrifugal force induced inward pivotal movement of the upper ends into the centrifuge positions; an outer ring adapted to pivotally support an annular array of outer containers having open upper ends and displaced outwardly from the inner array in a direction transverse to the rotational axis of the rotor means; an outer coupling coupled between the rotor and the outer ring so as to cause rotation thereof and resultant centrifugal force induced inward pivotal movement of the upper ends of the outer containers into centrifuge positions; and an inner orientation mechanism for preventing movement of the upper ends of the inner containers into their centrifuge positions.
    Type: Grant
    Filed: July 17, 1989
    Date of Patent: September 3, 1991
    Assignee: Zymark Corporation
    Inventors: Burleigh M. Hutchins, Raymond R. Dunlap, Louis Abrahams, Susan M. Amato
  • Patent number: 4607196
    Abstract: A torque-sensing rotary tool for use in bottle-capping, and other such applications. The tool (10) is characterized by independent motors (30 and 40) means for gripping and rotating bottles or the like and a rotation-counter which forms means, with associated circuitry (FIG. 9), to determine when an object, e.g. a bottle cap, may be safely lifted by automatic machinery, e.g. by robot means.
    Type: Grant
    Filed: September 23, 1985
    Date of Patent: August 19, 1986
    Assignee: Zymark Corporation
    Inventors: Louis Abrahams, Steven P. Carll
  • Patent number: 4510684
    Abstract: A means for automatically replacing tool means on a robot arm comprising a novel automatically releasable tool means, comprising electrical control conduits communicating with said robot and, in proper circumstance, with a tool rack to signal its position and condition on said rack.
    Type: Grant
    Filed: December 8, 1981
    Date of Patent: April 16, 1985
    Assignee: Zymark Corporation
    Inventors: Burleigh M. Hutchins, Louis Abrahams
  • Patent number: 4507044
    Abstract: A compact robot of the 3-axis type comprising a base-mounted motor control system with means to sense the position of a robot arm through a servo-system comprising position-sensing potentiometers mounted in the motor control system and a feed-back control system to co-ordinate the vertical and horizontal movement of a robot arm.
    Type: Grant
    Filed: December 8, 1981
    Date of Patent: March 26, 1985
    Assignee: Zymark Corporation
    Inventors: Burleigh M. Hutchins, Raymond R. Dunlap, Louis Abrahams
  • Patent number: 4488241
    Abstract: A robot system comprising readily interchangeable hands. Usually the system will be controlled by a computer which will communicate with servo motors in each hand through an analog pulse width generator on the robot. The computer controller will also be able to utilize robot-associated circuitry to obtain information directly from each hand.
    Type: Grant
    Filed: March 8, 1982
    Date of Patent: December 11, 1984
    Assignee: Zymark Corporation
    Inventors: Burleigh M. Hutchins, Louis Abrahams
  • Patent number: 4407988
    Abstract: A composition suitable for manufacturing into wear-resistant and chemically-inert articles, the composition being a mixture of 74 to 84% polytetrafluoroethylene, 7-17% graphite fibers, and 4-14% fluorinated graphite.
    Type: Grant
    Filed: March 25, 1982
    Date of Patent: October 4, 1983
    Assignee: Millipore Corporation
    Inventors: Louis Abrahams, Thomas P. J. Izod
  • Patent number: 4342679
    Abstract: A composition suitable for manufacturing into wear-resistant and chemically-inert articles, the composition being a mixture of 74 to 84% polytetrafluoroethylene, 7-17% graphite fibers, and 4-14% fluorinated graphite.
    Type: Grant
    Filed: August 27, 1980
    Date of Patent: August 3, 1982
    Assignee: Millipore Corporation
    Inventors: Louis Abrahams, Thomas P. J. Izod
  • Patent number: 4333977
    Abstract: A wear-resistant and chemically-inert article made from a sintered mixture of polytetrafluoroethylene, graphite fibers, and fluorinated graphite.
    Type: Grant
    Filed: August 27, 1980
    Date of Patent: June 8, 1982
    Assignee: Waters Associates, Inc.
    Inventors: Louis Abrahams, Thomas P. J. Izod
  • Patent number: 4281687
    Abstract: A pump for precise, smooth delivery of liquid, particularly in liquid chromatography systems, featuring two liquid displacement elements mounted for reciprocating movement in chambers connected in series with two check valves, one displacement element serving to accumulate some of the liquid delivered by the first element and to deliver the accumulated liquid while the first element is refilling. Also disclosed is a fluid storage device for smoothing pulses from the pump comprising a flattened tube wound into a helix and placed within an annulus formed by an inner and an outer cylindrical wall. These cylindrical walls maintain the flattened tubing from expanding beyond its elastic strain limit.
    Type: Grant
    Filed: February 25, 1980
    Date of Patent: August 4, 1981
    Assignee: Waters Associates, Inc.
    Inventors: Burleigh M. Hutchins, Louis Abrahams
  • Patent number: 4245963
    Abstract: A pump for precise, smooth delivery of liquid, particularly in liquid chromatography systems, featuring two liquid displacement elements mounted for reciprocating movement in chambers connected in series with two check valves, one displacement element serving to accumulate some of the liquid delivered by the first element and to deliver the accumulated liquid while the first element is refilling.
    Type: Grant
    Filed: February 9, 1979
    Date of Patent: January 20, 1981
    Assignee: Waters Associates, Inc.
    Inventors: Burleigh M. Hutchins, Louis Abrahams
  • Patent number: 4070285
    Abstract: A column for use in liquid chromatographic processes wherein the column is formed with an external reinforcing sleeve that has been found to contribute dimensional stability which results in surprising and important advantages in improving chromatographic performance. Another aspect of the invention comprises the preparation of the internal wall of the column which has an advantageous finish of 32 micro inches or better.
    Type: Grant
    Filed: December 24, 1975
    Date of Patent: January 24, 1978
    Assignee: Waters Associates, Inc.
    Inventor: Louis Abrahams
  • Patent number: 4027983
    Abstract: A plate-like structure comprising a liquid flow path formed in one face thereof, a thin ductile seal-forming coating on the face of the structure which forms the flow path. The structure finds many utilities, most advantageously in constructing a novel valve wherein the disk is flexible and adapted for flexing a central face portion thereof against a conduit, thereby sealing said conduit.
    Type: Grant
    Filed: April 9, 1975
    Date of Patent: June 7, 1977
    Assignee: Waters Associates, Incorporated
    Inventor: Louis Abrahams
  • Patent number: 4026803
    Abstract: Novel end fitting assemblies of particular advantage for use on liquid chromatographic columns, and novel chromatographic columns comprising these novel end fittings. The end-fittings are characterized by (a) very low dead space; (b) economical and convenient replacement of wearing parts; with minimal disturbing of the packed column, or other functional end-fitting components such as cones, filters, etc. A particular advantage is the design whereby the connector portions of the fitting assembly are not normally wetted by process fluids during operation of the column. Thus, the connector portions of the assemblies can be selected from a wide variety of mechanically-desirable materials selected for their wearing characteristics. Moreover, the fittings can be tightened for high-pressure operation without damage to the structure of the column of which they are used.
    Type: Grant
    Filed: December 24, 1975
    Date of Patent: May 31, 1977
    Assignee: Waters Associates
    Inventors: Louis Abrahams, Manuel A. Russo
  • Patent number: 3981620
    Abstract: A compact pumping system especially useful in liquid chromatography wherein comprising a liquid path which is fully flushed in each stroke of a pump, a pump which provides substantially pulse-free flow, a pressure-sensor integrated into said flow path and operably connected to the control circuit of a bifilar stepping motor. This circuit is so designed that the driving current applied to the motor is only that required to pump the liquid. The avoiding of heat associated with a greater current is particularly important in forming a compact package of motor and pump for use in liquid chromatography.
    Type: Grant
    Filed: November 19, 1973
    Date of Patent: September 21, 1976
    Assignee: Waters Associates, Inc.
    Inventors: Louis Abrahams, Burleigh M. Hutchins, Jr., James L. Waters
  • Patent number: 3958898
    Abstract: A compact pumping system especially useful in liquid chromatography wherein comprising a liquid path which is fully flushed on each stroke of a pump, a pump which provides substantially pulse-free flow, a pressure-sensor integrated into said flow path and operably connected to the control circuit of a bifilar stepping motor. This circuit is so designed that the driving current applied to the motor is only that required to pump the liquid. The avoiding of heat associated with a greater current is particularly important in forming a compact package of motor and pump for use in liquid chromatography.
    Type: Grant
    Filed: February 3, 1975
    Date of Patent: May 25, 1976
    Assignee: Waters Associates, Incorporated
    Inventors: Louis Abrahams, Burleigh M. Hutchins, Jr., James L. Waters
  • Patent number: RE32414
    Abstract: A compact robot of the 3-axis type comprising a base-mounted motor control system with means to sense the position of a robot arm through a servo-system comprising position-sensing potentiometers mounted in the motor control system and a feed-back control system to co-ordinate the vertical and horizontal movement of a robot arm.
    Type: Grant
    Filed: February 7, 1986
    Date of Patent: May 12, 1987
    Assignee: Zymark Corporation
    Inventors: Burleigh M. Hutchins, Raymond R. Dunlap, Louis Abrahams