Pipette pump

• US 3,310,002 A
• Filed: 10/18/1965
• Issued: 03/21/1967
• Est. Priority Date: 10/18/1965
• Status: Expired due to Term

• Current Assignee: Sam W. Wilburn
• Original Assignee: Sam W. Wilburn
• Inventors: Wilburn, Sam W.
• Application Number:
  US04/496,866
• Time in Patent Office: 519 Days
• US Class Current: 73/864.15
• CPC Class Codes: B01L 3/021 Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
• CPC Class Codes: B01L 3/0213 Accessories for glass pipettes; Gun-type pipettes, e.g. safety devices, pumps
• CPC Class Codes: Y10T 137/86919 Sequentially closing and opening alternately seating flow controllers

Claims

1. AN APPARATUS FOR DRAWING MEASURED QUANTITIES OF A LIQUID INTO AND EXPELLING THE SAME FROM A PIPETTE WHICH IS PARTIALLY SUBMERGED IN SAID LIQUID COMPRISING:

A PRIMARY CONDUIT CONNECTED AT ONE END TO SAID PIPETTE AND BRANCHING AT THE OTHER END TO FORM A FIRST AND A SECOND CONDUIT;

AN AIR DISPLACEMENT PUMP HAVING AN INLET AND AN OUTLET, SAID INLET AND SAID OUTLET HAVING A FIRST AND A SECOND TUBE RESPECTIVELY CONNECTED THERETO AND EXTENDING OUTWARDLY THEREFROM, SAID PUMP WHEN ENERGIZED BEING EFFECTIVE TO SIMULTANEOUSLY CREATE A NEGATIVE PRESSURE IN SAID FIRST TUBE AND A POSITIVE PRESSURE IN SAID SECOND TUBE, SAID FIRST AND SECOND TUBES BEING ASSOCIATED RESPECTIVELY WITH FIRST AND SECOND OPENINGS NORMALLY COMMUNICATING SAID FIRST AND SECOND TUBES WITH THE ATMOSPHERE;

AND FLEXIBLE VALVE MEANS HAVING A FIRST PASSAGEWAY CONNECTING SAID FIRST CONDUIT WITH SAID FIRST TUBE A SECOND PASSAGEWAY CONNECTING SAID SECOND CONDUIT WITH AND SECOND TUBE, SAID FIRST AND SAID SECOND PASSAGEWAYS EACH HAVING A BALL SECURELY SEATED THEREIN, SAID BALLS NORMALLY BLOCKING AIR COMMUNICATION BETWEEN SAID TUBES AND CONDUITS, SAID PUMP NORMALLY FORCING AIR TO FLOW INTO SAID FIRST OPENING AND OUT SAID SECOND OPENING, SAID FIRST PASSAGEWAY WHEN SELECTIVELY FLEXED, WITH SAID FIRST OPENING BEING CLOSED, BEING EFFECTIVE TO COMMUNICATE SAID FIRST TUBE WITH SAID FIRST CONDUIT TO DRAW LIQUID INTO SAID PIPETTE AND SAID SECOND PASSAGEWAY WHEN SELECTIVELY FLEXED, WITH SAID SECOND OPENING CLOSED, BEING EFFECTIVE TO COMMUNICATE SAID SECOND TUBE WITH SAID SECOND CONDUIT TO EXPEL LIQUID FROM SAID PIPETTE.