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:
Mar. 14, 2000
Filed:
Jul. 24, 1998
Leonid M Blumberg, Hockessin, DE (US);
Alan D Broske, West Chester, PA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
The present invention provides an improved method for calculating and adjusting the column head pressure of a GC instrument based on the column's plate capacity, N.sub.c, and film thickness, d.sub.s, measured ideally during the manufacturing process and identified with the column such that software associated with the GC instrument can calculate a new column head pressure based on the relationship between the plate capacity and film thickness of the existing column to the plate capacity and film thickness of the new or shortened column. The column head pressure of the GC is adjusted to the new column head pressure to provide a reduction in the column-to-column non-reproducibility error in retention times of all peaks.