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:
May. 31, 1994
Filed:
May. 04, 1993
Robert Groten, Weinheim/Steinklingen, DE;
Gerhard Heidecke, Bensheim, DE;
Thomas Mannsbart, Edingen-Neckarhausen, DE;
Volker Siekermann, Furth, DE;
Other;
Abstract
A biodegradable substrate in sheet form which acts as a source of carbon and hydrogen in oxygen-poor water in biological water-treatment stages. The substrate is covered with at least one layer of a population of spontaneously growing denitrifiers. The substrate is a spun-bonded non-woven fabric weighing 10 to 1500 g/m.sup.2. It has a prescribed effective area that results in an ideal rate of denitrification per clarification stage at a prescribed rate of flow per area and time. The fabric is comprised of at least 50% continuous poly-.epsilon.-caprolactone filament with a mean molecular weight of 20,000 to 70,000. The individual filaments adhere to each other at their intersections.