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:
Feb. 13, 2018
Filed:
Apr. 20, 2012
Nicolas Egeler, Krefeld, DE;
Marek Torbus, Krefeld, DE;
Milan Knezevic, Niskayuna, NY (US);
Gee Ho Bae, Ansan-Si, KR;
Robert Laitar, Woodridge, IL (US);
Douglas Trinowski, Rochester Hills, MI (US);
Wolfgang Seelbach, Korschenbroich, DE;
Nicolas Egeler, Krefeld, DE;
Marek Torbus, Krefeld, DE;
Milan Knezevic, Niskayuna, NY (US);
Gee Ho Bae, Ansan-Si, KR;
Robert Laitar, Woodridge, IL (US);
Douglas Trinowski, Rochester Hills, MI (US);
Wolfgang Seelbach, Korschenbroich, DE;
HUTTENES-ALBERTUS CHEMISCHE WERKE GMBH, Dusseldorf, DE;
Abstract
This invention relates to a resin preparable by reaction of a phenol/formaldehyde novolak with tetraethyl orthosilicate in a mass ratio above 28:1, wherein the phenol of the phenol/formaldehyde novolak is substituted or unsubstituted hydroxybenzene or a mixture of two or more such phenols, and to a particulate material coated with said resin. Said particles can be used e.g. in the shell molding process for the production of shell molds and shell cores; and as proppants for use in the hydraulic fracturing process.