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. 06, 2007
Filed:
Feb. 18, 2003
Applicant:
Thomas Dreifert, Kerpen, DE;
Inventor:
Thomas Dreifert, Kerpen, DE;
Assignee:
Oerlikon Leybold Vacuum GmbH, Cologne, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04C 18/107 (2006.01); F04C 18/344 (2006.01);
U.S. Cl.
CPC ...
Abstract
A pump () is provided with a housing (), having an inlet () and an outlet (), a drive (), a fixed cylinder () centered on a mid-axis (), a displacer (), rotating eccentrically within the cylinder (), a crank drive () for the displacer (), a circumferential sickle-shaped pumping chamber () between the cylinder () and displacer () and a helical sealing element () in the pumping chamber (). The pump is a dry vacuum pump, whereby the displacer () circulates in the cylinder () without making contact.