Daniel Harold Mack

US Patent:

41404882, Feb 20, 1979

Filed:

Sep 6, 1977

Appl. No.:

5/830705

Inventors:

Daniel R. Mack - Houston TX
James R. Eseke - Houston TX

Assignee:

Hycel, Inc. - Houston TX

International Classification:

B01L 302
G01N 114
G01N 3100

US Classification:

422100

Abstract:

Means for reducing intersample contamination in an automatic chemical testing apparatus, in which liquid from a sample is aspirated from a sample source into a reservoir, and aliquots of the sample are each dispensed into individual reaction containers for analysis by well-known means. A cylindrical reservoir is utilized with a piston therein shaped for pushing out virtually all of the remaining sample from the cylinder after dispensing the sample liquid through a hollow needle, communicating with the cylinder. A solid pin coaxially mounted within the piston is projected through the needle and has minimum clearance therewith, for pushing remaining sample out of the needle. The portion of the pin projecting through the needle is retracted into the piston prior to aspiration of liquid from a next sample.

Address:

7919 Sharpcrest St, Houston, TX 77036

VIN:

1J8GA591X7L162384

Make:

JEEP

Model:

WRANGLER UNLIMITED

Year:

2007