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:
Aug. 28, 2007
Filed:
Oct. 01, 2003
Donald Alfons Kubik, Dickenson, ND (US);
Boris Varshal, Lynn, MA (US);
Efim Ya. Lyublinski, Mayfield Heights, OH (US);
Barbara Ann Nygaard, Circle Pines, MN (US);
Donald Alfons Kubik, Dickenson, ND (US);
Boris Varshal, Lynn, MA (US);
Efim Ya. Lyublinski, Mayfield Heights, OH (US);
Barbara Ann Nygaard, Circle Pines, MN (US);
Northern Technologies International Corp., Beachwood, OH (US);
Abstract
An effective tarnish inhibiting ('TI') polymer composition including a scavenger for hydrogen sulfide optionally in the presence of an acid gas such as sulfur dioxide, provides excellent protection against tarnishing of the lustrous surfaces of a silver object. When the composition is thermoformed into a box-like container or extruded as film which contains uniformly dispersed solid micron-sized particles of the scavenger chosen from zinc oxide and a silicate of an alkali metal in an amount no greater than 5% by weight of the polymer, it is transparent so that the condition of the stored silver may be assessed. A solid inert adjuvant may be added. All solid particles in the material have a primary particle size smaller than 53 μm which makes it possible to obtain the uniform dispersion. A silver object may be wrapped in the film, or stored in a sealed box so that the solid particles in the polymer are not coated on the surfaces of the silver object.