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. 07, 1989
Filed:
Nov. 30, 1987
Applicant:
Inventors:
Bob De Mon, Alkmaar, NL;
Antonius I Van Hoorn, Koedijk, NL;
Assignee:
Hoogovens Groep B.V., IJmuiden, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
210777 ; 210909 ;
Abstract
A method of removal of polycyclic aromatic hydrocarbons (PAH) by precoat vacuum filtration is characterized in that organic particles are present in the precoat which, when subjected to a specific precoat layer build-up test, have a layer thickness in the range 30-200 mm. The immersion depth of the drum during the filtering is more than 40% of the drum diameter. Improved filtering results. A method of testing a finely divided organic material in order to determine its suitability for precoat vacuum filtration is also disclosed.