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US 6,552,280 B1Granted
Surface-hardened austenitic stainless steel precision weight and process of making same
AssigneeMettler-Toledo AG
InventorJean-Maurice Tellenbach
Life of this patent
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Abstract
A precision weight (1) has greater permanence of mass due to a hardened surface layer that provides greater wear and scratch resistance as well as greater corrosion resistance. The hardened surface layer is a diffusion layer of increased carbon and/or nitrogen concentration resulting from a heat treatment under gas atmosphere.
Claims19
A precision weight for performing at least one among a group of procedures consisting of:
- a calibration test of a weighing instrument,
- a calibration test of a measuring apparatus other than a weighing instrument,
- a calibration test of weights of a lower class of accuracy than said precision weight,
- a determination of a mass of an object on a weighing instrument, and
- a measurement of a physical quantity other than said determination of a mass,
- wherein said weight comprises austenitic stainless steel, said weight further comprises a surface layer, and said surface layer is hardened.
3 more elements
Dependencies are inferred from the claim text.