Issued Patents All Time
Showing 1–25 of 33 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7175813 | Volume adjustable manual pipette with quick set volume adjustment | James S. Petrek, Phillip Yee | 2007-02-13 |
| 6967004 | Pipette with improved pipette tip and mounting shaft | James S. Petrek, Steven T. Nielsen | 2005-11-22 |
| 6745636 | Pipette with improved pipette tip and mounting shaft | James S. Petrek | 2004-06-08 |
| 6737023 | Pipette with improved pipette tip mounting shaft | Christopher Kelly, James S. Petrek, Steven T. Nielsen | 2004-05-18 |
| 6645433 | Ergonomic return springless manual air displacement pipette | William D. Homberg, James S. Petrek | 2003-11-11 |
| 6568288 | Pipette with improved pipette tip and mounting shaft | James S. Petrek | 2003-05-27 |
| 6428750 | Volume adjustable manual pipette with quick set volume adjustment | Haakon T. Magnussen, Jr., Phillip Yee, William D. Homberg, James S. Petrek | 2002-08-06 |
| 6365110 | Blowout springless manual air displacement pipette with mechanical assist for aiding in locating and maintaining pipette plunger at a home position | William D. Homberg | 2002-04-02 |
| 6352673 | Ergonomic return springless manual air displacement pipette | William D. Homberg | 2002-03-05 |
| 6299841 | Bilaterally symmetrical battery powered microprocessor controlled lightweight hand-holdable electronic pipette | Christopher Kelly, James S. Petrek | 2001-10-09 |
| D448853 | Pipette tip | Christopher Kelly, James S. Petrek, Steven T. Nielsen | 2001-10-02 |
| 6254832 | Battery powered microprocessor controlled hand portable electronic pipette | Christopher Kelly, Haakon T. Magnujssen, Jr., William D. Homberg | 2001-07-03 |
| D438981 | Pipette tip | Christopher Kelly, James S. Petrek, Steven T. Nielsen | 2001-03-13 |
| D437940 | Pipette tip | Christopher Kelly, James S. Petrek, Steven T. Nielsen | 2001-02-20 |
| 6168761 | Pipette with improved pipette tip and mounting shaft | Christopher Kelly, James S. Petrek, Steven T. Nielsen | 2001-01-02 |
| D426642 | Electronic pipette | Christopher Kelly, James S. Petrek | 2000-06-13 |
| D426643 | Manual pipette | James S. Petrek | 2000-06-13 |
| 6045757 | Membrane filter pipette tip | Kent Gordon Moriarty, James S. Petrek | 2000-04-04 |
| 5792424 | Manual pipette with delayed-action home position latch | William D. Homberg, Christopher Kelly, Haakon T. Magnussen, Jr. | 1998-08-11 |
| 5779984 | Pipette tip rack and refill pack containing large maximized volume freely nestable pipette tips | Christopher Kelly, David J. Lemieux, Haakon T. Magnussen, Jr., James S. Petrek | 1998-07-14 |
| 5642816 | Pipette tip rack refill plate hold down apparatus | Christopher Kelly | 1997-07-01 |
| 5441702 | Refill pack for pipette tip racks | David J. Lemieux, Paul K. Chadwick, Christopher Kelly, James S. Petrek, Haakon T. Magnussen, Jr. +1 more | 1995-08-15 |
| 5392914 | Refill pack for pipette tip racks | David J. Lemieux, Paul K. Chadwick, Christopher Kelly, James S. Petrek, Haakon T. Magnussen, Jr. +1 more | 1995-02-28 |
| 5364596 | Manual pipette with plunger velocity governor, home position latch and trigger release | Haakon T. Magnussen, Jr., William D. Homberg | 1994-11-15 |
| 4861473 | Apparatus for facilitating compression of packing material in a liquid chromatography column | Carl L. Shackelford | 1989-08-29 |