The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 05, 1995
Filed:
Mar. 15, 1994
Applicant:
Inventors:
Hermanus H Lauer, Belmont, CA (US);
Douglass McManigill, Palo Alto, CA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ; G01N / ;
U.S. Cl.
CPC ...
2041801 ; 2042 / ;
Abstract
In accordance with the present invention, a compliant pressure differential is applied across a separation column while its inlet is in a sample solution so that sample solution is introduced into the column. The profile of pressure differential over time is selected so that a desired volume of sample solution is introduced. Pressure and time are controlled with sufficient precision to yield repeatability of 5%, and preferably within 1%, by volume. The pressure differential is sufficiently low and the time sufficiently long that an acceptable velocity profile can be achieved.