Patents by Inventor James S. Petrek

James S. Petrek 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).

  • Publication number: 20220008909
    Abstract: A pipette and sealing pipette tip can include features for generating a secure mounting engagement between the pipette and pipette tip without the need for protrusions on the pipette tip used for providing an interference fit and avoiding the need for a separate air-tight seal directly between the piston and shaft of the pipette.
    Type: Application
    Filed: July 7, 2020
    Publication date: January 13, 2022
    Inventor: James S. Petrek
  • Patent number: 11007517
    Abstract: A sub-1 ?L pipette having a small diameter metal tube that is concentrically located within the tip mounting shaft/portion of the pipette and extends from the distal end thereof by some predetermined distance so as to seal against the interior of a pipette tip that is installed to the tip mounting portion. The use of a small diameter metal tube and sealing of the metal tube against the inner surface of the pipette tip near a distal opening of the pipette tip allows for a minimal ullage volume.
    Type: Grant
    Filed: October 6, 2017
    Date of Patent: May 18, 2021
    Assignee: Mettler-Toledo Rainin, LLC
    Inventor: James S. Petrek
  • Patent number: 10471422
    Abstract: A pipette home position locating mechanism and a manual pipette equipped with such a home position locating mechanism. The home position locating mechanism is spring-biased but compressible in a proximal-to-distal direction. The spring preload force of the home position locating mechanism is selected to be greater than force of exerted by a stroke spring of the pipette to which the home position locating mechanism is attached while the stroke spring is at its blowout position, but less than the combined force exerted by the stroke spring at its blowout position and a blowout spring of the pipette in its preload position.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: November 12, 2019
    Assignee: Mettler-Toledo Rainin, LLC
    Inventors: James S. Petrek, William D. Homberg
  • Publication number: 20190001319
    Abstract: A pipette home position locating mechanism and a manual pipette equipped with such a home position locating mechanism. The home position locating mechanism is spring-biased but compressible in a proximal-to-distal direction. The spring preload force of the home position locating mechanism is selected to be greater than force of exerted by a stroke spring of the pipette to which the home position locating mechanism is attached while the stroke spring is at its blowout position, but less than the combined force exerted by the stroke spring at its blowout position and a blowout spring of the pipette in its preload position.
    Type: Application
    Filed: June 30, 2017
    Publication date: January 3, 2019
    Inventors: James S. Petrek, William D. Homberg
  • Publication number: 20180099270
    Abstract: A sub-1 ?L pipette having a small diameter metal tube that is concentrically located within the tip mounting shaft/portion of the pipette and extends from the distal end thereof by some predetermined distance so as to seal against the interior of a pipette tip that is installed to the tip mounting portion. The use of a small diameter metal tube and sealing of the metal tube against the inner surface of the pipette tip near a distal opening of the pipette tip allows for a minimal ullage volume.
    Type: Application
    Filed: October 6, 2017
    Publication date: April 12, 2018
    Inventor: James S. Petrek
  • Publication number: 20160271603
    Abstract: A two-piece sealing pipette tip includes features to join the pieces in an air-tight manner without adhesive, and to seal the tip directly against the piston in an air displacement pipette, thereby avoiding the need for a piston seal within the pipette. This configuration reduces potential points of failure, allows the pipette-tip interface to be optimized, and improves liquid handling characteristics of the pipette.
    Type: Application
    Filed: June 1, 2016
    Publication date: September 22, 2016
    Inventor: James S. Petrek
  • Patent number: 9221046
    Abstract: An air displacement pipette includes a segmented, stepped piston configured to displace additional air at a higher velocity during a blowout stroke, thereby enabling improved dispensing accuracy by more completely dislodging adhering liquid from a pipette tip following the preceding dispensing stroke.
    Type: Grant
    Filed: January 30, 2014
    Date of Patent: December 29, 2015
    Assignee: Rainin Instrument, LLC
    Inventors: James S Petrek, David M Johnson
  • Publication number: 20150209777
    Abstract: An air displacement pipette includes a segmented, stepped piston configured to displace additional air at a higher velocity during a blowout stroke, thereby enabling improved dispensing accuracy by more completely dislodging adhering liquid from a pipette tip following the preceding dispensing stroke.
    Type: Application
    Filed: January 30, 2014
    Publication date: July 30, 2015
    Inventors: James S. Petrek, David M. Johnson
  • Publication number: 20130312545
    Abstract: A sealing pipette tip includes features to seal the tip directly against the piston in an air displacement pipette, avoiding the need for a piston seal within the pipette. This configuration reduces potential points of failure, allows the pipette-tip interface to be optimized, and improves liquid handling characteristics of the pipette.
    Type: Application
    Filed: August 2, 2013
    Publication date: November 28, 2013
    Applicant: Rainin Instrument, LLC
    Inventor: James S. Petrek
  • Patent number: 8524170
    Abstract: A sealing pipette tip includes features to seal the tip directly against the piston in an air displacement pipette, avoiding the need for a piston seal within the pipette. This configuration reduces potential points of failure, allows the pipette-tip interface to be optimized, and improves liquid handling characteristics of the pipette.
    Type: Grant
    Filed: February 22, 2011
    Date of Patent: September 3, 2013
    Assignee: Rainin Instrument, LLC
    Inventor: James S. Petrek
  • Patent number: 8397593
    Abstract: A volume adjustable pipette, comprising a plunger mounted for movement in a housing to and from a stop to aspirate a fluid into and dispense the fluid from a tip extending from the housing. The movement of the plunger is damped to reduce sudden plunger movements. An axially moveable volume setting member in the housing defines the stop and a volume setting for the pipette and is axially moveable by a user turnable volume setting member. Turning of the volume adjusting member also controls a coarse volume setting means and a fine volume setting means, the course volume setting means being responsive to a relatively small turning of the volume adjusting member for moving the volume setting member a relatively large axial distance and the fine volume setting means being responsive to a relatively large turning of the volume adjusting member for moving the volume setting member a relatively small axial distance.
    Type: Grant
    Filed: August 13, 2009
    Date of Patent: March 19, 2013
    Assignee: Rainin Instrument, LLC
    Inventors: James S. Petrek, Michael C. Schmittdiel, William D. Homberg
  • Publication number: 20120213677
    Abstract: A sealing pipette tip includes features to seal the tip directly against the piston in an air displacement pipette, avoiding the need for a piston seal within the pipette. This configuration reduces potential points of failure, allows the pipette-tip interface to be optimized, and improves liquid handling characteristics of the pipette.
    Type: Application
    Filed: February 22, 2011
    Publication date: August 23, 2012
    Applicant: Rainin Instrument, LLC
    Inventor: James S. Petrek
  • Publication number: 20110036185
    Abstract: A volume adjustable pipette, comprising a plunger mounted for movement in a housing to and from a stop to aspirate a fluid into and dispense the fluid from a tip extending from the housing. The movement of the plunger is damped to reduce sudden plunger movements. An axially moveable volume setting member in the housing defines the stop and a volume setting for the pipette and is axially moveable by a user turnable volume setting member. Turning of the volume adjusting member also controls a coarse volume setting means and a fine volume setting means, the course volume setting means being responsive to a relatively small turning of the volume adjusting member for moving the volume setting member a relatively large axial distance and the fine volume setting means being responsive to a relatively large turning of the volume adjusting member for moving the volume setting member a relatively small axial distance.
    Type: Application
    Filed: August 13, 2009
    Publication date: February 17, 2011
    Applicant: RAININ INSTRUMENT, LLC
    Inventors: James S. Petrek, Michael C. Schmittdiel, William D. Homberg
  • Patent number: 7819030
    Abstract: A hybrid manual-electronic pipette combines a manually driven piston with real-time electronic measurement of liquid volume and piston displacement while compensating for both pipette-specific and pipette model-specific variations. The hybrid nature of the pipette facilitates increased accuracy and improved ease of use, and enables additional functionalities not practicable with traditional manual pipettes.
    Type: Grant
    Filed: September 27, 2007
    Date of Patent: October 26, 2010
    Assignee: Rainin Instrument, LLC
    Inventors: Haakon T. Magnussen, James S. Petrek, William D. Homberg
  • Patent number: 7788986
    Abstract: A hybrid manual-electronic pipette combines a manually driven piston with real-time electronic measurement of liquid volume and piston displacement while compensating for both pipette-specific and pipette model-specific variations. The hybrid nature of the pipette facilitates increased accuracy and improved ease of use, and enables additional functionalities not practicable with traditional manual pipettes.
    Type: Grant
    Filed: September 27, 2007
    Date of Patent: September 7, 2010
    Assignee: Rainin Instrument, LLC
    Inventors: Haakon T. Magnussen, James S. Petrek, William D. Homberg, Christian K. Apple
  • Publication number: 20100199789
    Abstract: A hybrid manual-electronic pipette combines a manually driven piston with real-time electronic measurement of liquid volume and piston displacement while compensating for both pipette-specific and pipette model-specific variations. The hybrid nature of the pipette facilitates increased accuracy and improved ease of use, and enables additional functionalities not practicable with traditional manual pipettes.
    Type: Application
    Filed: April 26, 2010
    Publication date: August 12, 2010
    Applicant: RAININ INSTRUMENT, LLC
    Inventors: Haakon T. Magnussen, Andrew Vainshtein, James S. Petrek, William D. Homberg
  • Patent number: 7770475
    Abstract: A hybrid manual-electronic pipette combines a manually driven piston with real-time electronic measurement of liquid volume and piston displacement while compensating for both pipette-specific and pipette model-specific variations. The hybrid nature of the pipette facilitates increased accuracy and improved ease of use, and enables additional functionalities not practicable with traditional manual pipettes.
    Type: Grant
    Filed: September 27, 2007
    Date of Patent: August 10, 2010
    Assignee: Rainin Instrument, LLC
    Inventors: Haakon T. Magnussen, James S. Petrek, William D. Homberg, Andrew Vainshtein, Christian K. Apple
  • Patent number: 7726212
    Abstract: A hybrid manual-electronic pipette combines a manually driven piston with real-time electronic measurement of liquid volume and piston displacement while compensating for both pipette-specific and pipette model-specific variations. The hybrid nature of the pipette facilitates increased accuracy and improved ease of use, and enables additional functionalities not practicable with traditional manual pipettes.
    Type: Grant
    Filed: September 27, 2007
    Date of Patent: June 1, 2010
    Assignee: Rainin Instrument, LLC
    Inventors: Haakon T. Magnussen, Andrew Vainshtein, James S. Petrek, William D. Homberg
  • Publication number: 20090000403
    Abstract: A hybrid manual-electronic pipette combines a manually driven piston with real-time electronic measurement of liquid volume and piston displacement while compensating for both pipette-specific and pipette model-specific variations. The hybrid nature of the pipette facilitates increased accuracy and improved ease of use, and enables additional functionalities not practicable with traditional manual pipettes.
    Type: Application
    Filed: September 27, 2007
    Publication date: January 1, 2009
    Applicant: Rainin Instrument, LLC
    Inventors: Haakon T. Magnussen, Andrew Vainshtein, James S. Petrek, William D. Homberg
  • Publication number: 20090000351
    Abstract: A hybrid manual-electronic pipette combines a manually driven piston with real-time electronic measurement of liquid volume and piston displacement while compensating for both pipette-specific and pipette model-specific variations. The hybrid nature of the pipette facilitates increased accuracy and improved ease of use, and enables additional functionalities not practicable with traditional manual pipettes.
    Type: Application
    Filed: September 27, 2007
    Publication date: January 1, 2009
    Applicant: Rainin Instrument LLC
    Inventors: Haakon T. Magnussen, James S. Petrek, Willam D. Homberg