Patent · US Expired

Process for making carbon foam induced by process depressurization

US6576168B2 · kind B2 · utility

54Cited by
12References
21Claims
0Family size

Assignee

Inventors

Key dates

Filing dateMay 22, 2001
Grant dateJun 10, 2003
Priority date—
Expiry dateMay 22, 2021

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC04B2111/00982
  • WIPO fieldMaterials, metallurgy
  • WIPO sectorChemistry

Abstract

A process for producing molded pitch based foam is shown which provides a more uniform density gradient throughout the ultimate product. The process utilizes a pressure drop during processing in order to induce foaming. By inducing foaming through process depressurization, additional viscosity manipulation can be achieved as well as improved density gradient characteristics in the ultimate product.

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