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:
Jan. 01, 2013
Filed:
May. 13, 2009
William J. Boardman, Danville, CA (US);
Thomas B. Casserly, San Ramon, CA (US);
Deepak Upadhyaya, Fremont, CA (US);
Karthik Boinappaly, Fremont, CA (US);
Rahul Ramamurti, Walnut Creek, CA (US);
William J. Boardman, Danville, CA (US);
Thomas B. Casserly, San Ramon, CA (US);
Deepak Upadhyaya, Fremont, CA (US);
Karthik Boinappaly, Fremont, CA (US);
Rahul Ramamurti, Walnut Creek, CA (US);
Sub-One Technology, Inc., Pleasanton, CA (US);
Abstract
A method of coating at least one exterior surface of at least one workpiece is disclosed. The method may be used for coating inner and outer surfaces of pipes. A hollow workpiece is positioned within a chamber. A spacing between a multi-dimensional interior surface of the chamber and an exterior surface of the workpiece is fixed. Conditions are established to maintain a hollow cathode effect within the spacing and within the hollow workpiece. The conditions include biasing anodes at opposite ends of a hollow cathode effect region, and biasing the interior surface of the chamber and the workpiece as cathodes. The interior surface and the workpiece may be maintained at a common bias voltage or, in at least one embodiment, at differing voltages.