Back to results
US 4,374,620 AGranted
Photometric flow cell
AssigneeAltex Scientific, Inc.
InventorsAlan C. Berick, Haakon T. Magnussen, Jr.
Life of this patent
Estimating the term…
Abstract
A photometric flow cell for high pressure liquid chromatography having an illuminated passageway therein between open ends of which fluid samples are flowed for analysis. An annular, porous flow impedance element is supported in an annular channel surrounding one end of the passageway. The impedance element reduces turbulence of flow through the open end by evenly distributing the flowing fluid circumferentially about the end opening.
Claims13
A photometric flow cell comprising:
- a flow cell body having a passageway for receiving and passing fluid samples between opposite ends thereof;
- optically transparent windows at said opposite ends of said passageway for passing light along an optical path through sample in said passageway;
- an annular channel around one of said opposite ends of said passageway;
- and
- flow impedance means including a microporous annulus in said channel surrounding said one of said opposite ends for circumferentially distributing fluid flowing therethrough.
2 more elements
In combination:
- a flow cell body having a passageway for receiving and passing fluid samples between opposite ends thereof;
- means for measuring a characteristic of fluid sample while in the passageway;
- and
- fluid flow impedance means including a microporous annulus surrounding one of said opposite ends of said passageway for circumferentially distributing fluid flowing therethrough about the circumference of said one of said opposite ends.
1 more element
Dependencies are inferred from the claim text.