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:
Nov. 10, 2015
Filed:
Sep. 10, 2013
Heraeus Precious Metals North America Conshohocken Llc, West Conshohocken, PA (US);
Samson Shahbazi, Roslyn, PA (US);
Mark Challingsworth, Glenside, PA (US);
Steve Grabey, Hazleton, PA (US);
Ryan Persons, Newtown Square, PA (US);
Heraeus Precious Metals North America Conshohocken LLC, West Conshohocken, PA (US);
Abstract
An electroconductive paste comprising first copper particles having a specific surface area of about 0.15-1.0 m/g, second copper particles having a specific surface area of about 0.5-2.5 m/g, glass frit and an organic vehicle. According to another embodiment of the invention, the first copper particles are about 60-80 wt. % of the paste, while the content of the second copper particles is up to about 20 wt. % of the paste. According to another embodiment, the glass frit is lead-free and is about 1-10 wt. % of the paste. Preferably, the glass frit comprises a boron-zinc-barium oxide glass frit. According to another embodiment, the paste further comprises copper oxide. Another embodiment of the invention relates to an electroconductive paste comprising about 60-95 wt. % copper component, a boron-zinc-barium oxide glass frit, and an organic vehicle.