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:
Jun. 02, 2009
Filed:
Mar. 31, 2006
Santhana Raghavan Parthasarathy, Nashua, NH (US);
Yuepeng Wan, Nashua, NH (US);
Carl Chartier, Manchester, NH (US);
Jonathan a Talbott, Amherst, NH (US);
Kedar P Gupta, Hollis, NH (US);
Santhana Raghavan Parthasarathy, Nashua, NH (US);
Yuepeng Wan, Nashua, NH (US);
Carl Chartier, Manchester, NH (US);
Jonathan A Talbott, Amherst, NH (US);
Kedar P Gupta, Hollis, NH (US);
GT Solar Incorporated, Merrimack, NH (US);
Abstract
A process for making silicon ingots using a multi-part, reusable, graphite crucible of at least two mold pieces configured for assembly into an open top mold having an interior surface functional as a mold cavity for receiving molten silicon; removing or reducing a prior applied release coating from the interior surface until a uniformly smooth finish is achieved; coating the interior surface with a first layer of release coating comprising silicon nitride; coating the interior surface with a second layer of release coat comprising silica suspended in water; coating the interior surface with a third layer of release coat comprising silicon nitride; curing the release coat on said crucible; casting a silicon ingot in the crucible; and then repeating the prior steps multiple times.