Tantalum powder and method of making same
Patent 5261942 Issued on November 16, 1993. Estimated Expiration Date: 
March 10, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 10, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesProduction of highly reflective metal flake Method for improving handling properties of a flaked tantalum powder composition Process for producing metallic powders Patent #: 4705560 InventorsAssigneeApplicationNo. 849994 filed on 03/10/1992US Classes:75/342, Spheroidizing or rounding of existing solid metal particles75/343, Producing or purifying free metal powder or producing or purifying alloys in powder form (i.e., named or of size up to 1,000 microns in its largest dimension)75/365Step at 300 degrees C or greater after step at less than 300 degrees C using nonmetallic material which is liquid under standard conditionsExaminersPrimary: Wyszomierski, GeorgeAttorney, Agent or FirmInternational ClassB22F 009/04AbstractAn improved flaked tantalum powder and process for making the flaked powder are disclosed. The powder is characterized by having a Scott density greater than about 18 g/in3 and preferably at least about 90% of the flake particles having no dimension greater than about 55 micrometers. Agglomerates of the flaked tantalum powder, provide improved flowability, green strength and pressing characteristics compared to conventional flaked tantalum powders. The improved flaked tantalum powder can be made by preparing a flaked tantalum and then reducing the flake size until a Scott density greater than about 18 g/in3 is achieved. The invention also provides pellets and capacitors prepared from the abovedescribed flaked tantalum powder.Field of SearchContaining free metalSpheroidizing or rounding of existing solid metal particles Producing or purifying free metal powder or producing or purifying alloys in powder form (i.e., named or of size up to 1,000 microns in its largest dimension) Step at 300 degrees C or greater after step at less than 300 degrees C using nonmetallic material which is liquid under standard conditions Vanadium(V), Niobium(Nb) or Columbium(Cb), or Tantalum(Ta), singly or in combination Loose particulate mixture (i.e., composition) containing metal particles | |
