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, 2012
Filed:
Jun. 01, 2007
Lane Daniel Dicken, Davenport, IA (US);
Arthur R. Nelson, Davenport, IA (US);
Dennis Eugene Lund, Jr., Bettendorf, IA (US);
Daniel James Belk, Long Grove, IA (US);
Lane Daniel Dicken, Davenport, IA (US);
Arthur R. Nelson, Davenport, IA (US);
Dennis Eugene Lund, Jr., Bettendorf, IA (US);
Daniel James Belk, Long Grove, IA (US);
Carleton Life Support Systems, Inc., Davenport, IA (US);
Abstract
A retainer and spring with threaded end are machined from a single piece of material for threading to a piston in a closed cycle cryogenic cooler. Since the machined retainer and spring are a unitary part, they cannot rub against each other during operation of the piston which reduces debris generation. The spring is preferably formed as a double start helix which further increases axial stability and reduces side loading. The spring extends into an integrally formed, threaded end at the end thereof opposite the retainer.