Patents by Inventor John Fleming

John Fleming 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).

  • Energy monitor for a centrifuge instrument
    Patent number: 5600076
    Abstract: An energy monitoring arrangement that is operatively associated with a centrifuge instrument monitors the magnitude of applied accelerating energy that is used to accelerate a rotor and to interrupt the continued application of accelerating energy if the magnitude of the applied accelerating energy exceeds a predetermined reference energy value. Preferably, the net applied accelerated energy to the rotor is monitored and used in the comparison with the energy reference. The invention may also be used in a predictive manner to provide, early in the centrifugation run, an indication of the energy of a rotor at an operator-ordered set velocity.
    Type: Grant
    Filed: July 29, 1994
    Date of Patent: February 4, 1997
    Assignee: Sorvall Products, L.P.
    Inventors: John A. Fleming, William A. Romanauskas
  • Centrifuge rotor identification system
    Patent number: 5338283
    Abstract: The present invention is directed to a rotor identification system operable to identify each of a plurality of 2.sup.N rotors. Each rotor has at least two synchronizing detectable elements thereon and up to N additional identifying detectable elements. The identification system comprises a first and a second detector, each detector being operative to generate a synchronizing signal upon the passage of a synchronizing detectable element in proximity thereto; and means responsive to the substantially simultaneous generation of a synchronizing signal from each of the first and second detectors for generating an identification enabling signal. Rotor identification signal generating means responsive to the identification enabling signal is provided for generating a rotor identification signal in accordance with the number of identifying detectable elements provided on the rotor.
    Type: Grant
    Filed: October 9, 1992
    Date of Patent: August 16, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: John A. Fleming, Edward A. Kakos
  • Root crop harvester
    Patent number: 5031703
    Abstract: A root crop harvester comprising a soil-separating primary web arranged to discharge material on to a crop-conveying second web which passes about two rollers adapted to define in the load-bearing run of the second web an overhanging step section.
    Type: Grant
    Filed: November 22, 1989
    Date of Patent: July 16, 1991
    Assignee: National Research Development Corporation
    Inventor: John Fleming
  • Method and apparatus for automatically positioning centrifuge tubes
    Patent number: 3951334
    Abstract: A locking ring having castellations is provided for a swinging bucket-type centrifuge. The locking ring is constructed such that the castellations can be angularly positioned relative to the rotor to either block or permit the buckets to swing outwardly during operation. The angular positioning of the castellations relative to the buckets is accomplished by relative angular acceleration and deceleration between the rotor and the locking ring.
    Type: Grant
    Filed: July 7, 1975
    Date of Patent: April 20, 1976
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: John A. Fleming, Lawrence R. Barrett