Biodegradable sheet for culturing sewage denitrifiers
Patent 5316832 Issued on May 31, 1994. Estimated Expiration Date: 
May 4, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 4, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesNonwoven sheets of filaments of anisotropic melt-forming polymers and method thereof Low viscosity ethylene acrylic copolymers for nonwovens Patent #: 4769279 InventorsAssigneeApplicationNo. 057585 filed on 05/04/1993US Classes:442/401, Spun-bonded nonwoven fabric210/903NitrogenousExaminersPrimary: Bell, James J.Attorney, Agent or FirmInternational ClassD03D 003/00Foreign Application Priority Data1992-06-25 DEAbstractA 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/m2. 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-&3xb5;-caprolactone filament with a mean molecular weight of 20,000 to 70,000. The individual filaments adhere to each other at their intersections.Field of SearchNitrogenous | |
