Rinsing pipette

• US 3,233,785 A
• Filed: 09/13/1962
• Issued: 02/08/1966
• Est. Priority Date: 09/13/1962
• Status: Expired due to Term

• Current Assignee: Charles Burke Robert
• Original Assignee: Charles Burke Robert
• Inventors: CHARLES BURKE ROBERT
• Application Number:
  US04/223,469
• Time in Patent Office: 1,244 Days
• US Class Current: 73/864.02
• CPC Class Codes: B01L 3/021 Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids

Claims

1. A RINSING PIPETTE COMPRISING A TRANSPARENT TUBE HAVING AN UPPER RINSING SECTION AND A LOWER SAMPLE-RECEIVING SECTION, SAID LOWER SAMPLE-RECEIVING SECTION HAVING A TAPERED LOWER END AND HAVING A NARROW BORE CAPILLARY PASSAGE OF UNIFORM CROSS SECTION EXTENDING THERETHROUGH, SAID CAPILLARY PASSAGE BEING OF A PREDETERMINED VOLUMETRIC CAPACITY WITHIN THE RANGE OF .001 TO 0.1 MILLILITER AND BEING FILLABLE UNDER FORCES OF CAPILLARY ATTRACTION WHEN SAID TAPERED END IS INSERTED INTO A BODY OF LIQUID TO BE SAMPLED, SAID UPPER RINSING SECTION HAVING AN ENLARGED CHAMBER OF SUBSTANTIALLY GREATER DIAMETER AND VOLUME THAN SAID CAPILLARY PASSAGE AND COMMUNICATION WITH SAID PASSAGE, SAID CHAMBER AND PASSAGE MEETING ALONG A LINE DEFINING THE AUTOMATIC LIMIT LINE FOR THE INTAKE OF LIQUID INTO SAID PASSAGE BY CAPILLARY ATTRACTION, WHEREBY, SAID PASSAGE MAY BE COMPLETELY FILLED WITH A LIQUID SAMPLE OF PREDETERMINED VOLUME SIMPLY BY INSERTING THE LOWER END OF SAID PIPETTE INTO A BODY OF LIQUID, AND A COLLAPSIBLE BULB MOUNTED AT THE UPPER END OF SAID TUBE AND COMMUNICATING WITH SAID CHAMBER, SAID BULB HAVING AN OPENING IN THE WALL THEREOF AND BEING ADAPTED TO BE SQUEEZED AND RELEASED FOR RINSING SAID CAPILLARY PASSAGE WITH A SAMPLE-DILUTING SOLUTION AND FOR THOROUGHLY MIXING A SAMPLE WITH SAID SOLUTION.