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:
Jun. 27, 2023
Filed:
Sep. 03, 2020
Applicants:
John F. Thompson, Deer Park, IL (US);
Lars Kohler, Aurora, IL (US);
Qun Song, Gurnee, IL (US);
Jane C. LI, Arlington Heights, IL (US);
Inventors:
John F. Thompson, Deer Park, IL (US);
Lars Kohler, Aurora, IL (US);
Qun Song, Gurnee, IL (US);
Jane C. Li, Arlington Heights, IL (US);
Assignee:
NL Chemical Technology, Inc., Mount Prospect, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D 69/12 (2006.01); B01D 61/02 (2006.01); C02F 1/44 (2023.01); B01D 71/56 (2006.01); C02F 103/08 (2006.01);
U.S. Cl.
CPC ...
B01D 69/125 (2013.01); B01D 61/025 (2013.01); B01D 71/56 (2013.01); C02F 1/441 (2013.01); C02F 2103/08 (2013.01);
Abstract
A composite reverse osmosis membrane having a semipermeable bilayer polyamide composition comprising a base layer containing a rigid crosslinked aromatic polyamide and a top layer containing a flexible aliphatic polyamide is disclosed, the two layers in combination providing reduced salt passage in reverse osmosis desalination of brackish waters and of seawater.