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. 07, 1976
Filed:
Jun. 18, 1975
William F Beyer, Portage, MI (US);
Harry S Dankert, Kalamazoo, MI (US);
The Upjohn Company, Kalamazoo, MI (US);
Abstract
A method and apparatus for removing a small metal filter from a liquid chromatographic column, wherein a retaining member is clamped around the tube. A first centering device is releasably centered on the retaining member in alignment with the filter, whereupon a drill is slidably guided through the centering device for forming a hole of selected depth in the filter. The first centering device is removed and a second centering device is supported on the retainer, which second centering device has a threaded opening therethrough aligned with the filter. An extractor is threaded into the opening so that the end of the extractor is disposed directly adjacent the filter. A tapping unit having an elongated thread-forming tap is slidably inserted through an opening formed in the extractor, which opening is aligned with the hole formed in the filter. The tapping unit is threaded inwardly so that the tap threadably engages the filter and until a handle on the tapping unit abuts the extractor. The second centering device and the tapping unit are then held in a nonrotatable condition, and the extractor is reversely rotated so as to thread same out of the second centering device, whereby the tapping unit is axially displaced outwardly away from the second centering unit so that a pulling force is imposed on the filter to remove same from the end of the column.