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:
Feb. 15, 1994
Filed:
Nov. 03, 1992
William W Burt, Hawthorne, CA (US);
TRW Inc., Redondo Beach, CA (US);
Abstract
A photolithographic etching process for accurately and uniformly fabricating wire screen disks of varying complex geometries for cryogenic cooler regenerators. The photolithographic etching process includes the steps of applying a photoresist to a sheet of wire screen, developing the photoresist in the form of one or more desired disk shapes, and then etching the developed sheet of wire screen to form the wire screen disks. The etching process of the present invention produces wire screen disks with solid edges, thus ensuring that the wire screen disks fit properly in the regenerator. Also, these edges have no loose or bent wires which can break off and potentially damage the compressor and other moving parts of the cryogenic cooler. The etching process of the present invention can be used to fabricate wire screen disks with varying complex geometries, thus allowing for the construction of cryogenic coolers having complex, but more efficient, configurations.