Patent · US Active

Process for the production of ballast

US9297121B2 · kind B2 · utility

0Cited by

9References

5Claims

0Family size

Assignee

Covestro Deutschland AG · DE

Inventors

Andreas Hoffmann · North Bend, US
Torsten Erwe · Odenthal, DE
Udo Maier · Idstein, DE
Hans-Guido Wirtz · Leverkusen, DE
Thomas Kleiner · Nussbaumen, CH
Ralf Busch · Riegelsberg, DE

Key dates

Filing date	Mar 21, 2012
Grant date	Mar 29, 2016
Priority date	—
Expiry date	May 8, 2032

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G2101/00
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A process for the production of ballast for railway track laying, road construction, dam construction and bank protection, wherein ballast stones are spread out to form ballast and a reaction mixture for the preparation of a polyurethane foam, produced from components by a low-pressure process, is applied between the spread ballast stones.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.