Disclosed are corrosion resistant, non-magnetic austenitic stainless steels containing alloying elements molybdenum, nickel, and copper and further containing small quantities of an additional element selected from the group consisting of a rare-earth element, calcium, cobalt, iridium, osmium, rhenium, rhodium, ruthenium, silver, and a combination …

Legal parties

Inventors (applicants): Hendrik John
Assignees (initial): Baker Hughes Incorporated (Houston, US)
Agents: Cantor Colburn LLP (attorney)

The application was examined by Deborah Yee (USPTO dept. 1733)


  • 1. A corrosion resistant non-magnetic austenitic stainless steel, comprising: …
  • 2. The non-magnetic austenitic stainless steel of claim 1 , further comprising: …
  • 3. The non-magnetic austenitic stainless steel of claim 1 , wherein the additional element is a rare …

Cited documents


  • Igarashi et al. US 2005/0178477 A1, Aug. 1, 2005
  • Saller et al. US 2005/0145308 A1, Jul. 1, 2005
  • Angeliu US 5906791 A / 420/40, May. 1, 1999
  • Sundstrom et al. US 2007/0089810 A1, Apr. 1, 2007
  • EP 2248919 A1, Nov. 1, 2010
  • Ishikawa et al. US 2010/0272593 A1, Oct. 1, 2010
  • Yaguchi et al. US 2008/0000554 A1, Jan. 1, 2008



Non-magnetic, austenitic stainless steels have been developed in recent years to meet the needs of applications and equipment requiring material having low relative magnetic permeability, such as in the medical …

Cross Reference to Related Application

This application claims the benefit of U.S. Provisional Application Ser. No. 61/079,924 filed Jul. 11, 2008, which is hereby incorporated by reference in its …

Detailed Description

Disclosed herein are corrosion resistant non-magnetic austenitic stainless steels (NMSS) having increased pitting corrosion resistance and increased general corrosion resistance. The improved corrosion resistance can be obtained by increasing the content …

More details about Pitting Corrosion Resistant Non-Magnetic Stainless Steel

Miscellaneous patent data

The protection scope is defined by 22 claims, the grant number is 08535606, particularly claims a corrosion resistant non-magnetic austenitic stainless steel, comprising…, the patent extension term is 608 days, the application number is 12/499,842 (U.S.), the known applicant's name is John Hendrik, the invention is titled Pitting Corrosion Resistant Non-Magnetic Stainless Steel, the inventor's name is Hendrik John, similar classification categories are Making alloys containing metallic or non-metallic fibres or filaments, Iron base, Noble metal containing, Nitrogen containinig, Noble metal containing, Intermetallic matrix material, melting, Molybdenum or tungsten containing, zinc as the next major constituent, based on carbides or carbonitrides, the assignee is categorized as a United States company, the claim 1 is exemplary as chosen by the examiner, the known agent - Cantor Colburn LLP, the application was published on Jul. 9, 2009, the grant publication date is Sep. 17, 2013, categorized under Molybdenum or tungsten containing as a primary classification, the examination was conducted by Deborah Yee, the main examiner (1733 USPTO department), developed by Hendrik John, the assignee company is Baker Hughes Incorporated located in Houston (US).

Invention classification information

The invention is classified under with more than 1.5% by weight of manganese, Copper containing, with more than 1.5% by weight of silicon, Forging, Nickel containing, Noble metal containing, Rare earth containing, Chromium containing, Copper containing, Over 0.20 percent nitrogen containing, Eight percent or more total content of nickel and / or manganese containing, Molybdenum or tungsten containing. The designated search classifications include Rare earth containing, Forging, Over 0.20 percent nitrogen containing, Eight percent or more total content of nickel and / or manganese containing, Copper containing, Molybdenum or tungsten containing, Copper containing, Nickel containing, Chromium containing, Noble metal containing.

Patent details
Publication number 08535606
Publication date Sep. 17, 2013
Kind code B2
Application number 12/499,842
Application date Jul. 9, 2009
Application type U
Application series code 12
Extension term 608
National classification 420/57
Total number of claims 22
Exemplary claims 1
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