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:
Dec. 27, 2022
Filed:
Aug. 05, 2020
Applicant:
Robert J. Petersen, Minneapolis, MN (US);
Inventor:
Robert J. Petersen, Minneapolis, MN (US);
Assignee:
NL Chemical Technology, Inc., Mount Pleasant, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C02F 1/44 (2006.01); C02F 103/08 (2006.01);
U.S. Cl.
CPC ...
C02F 1/441 (2013.01); C02F 2103/08 (2013.01); C02F 2301/026 (2013.01);
Abstract
Spiral wound reverse osmosis devices with reduced lateral leakage and thereby increased salt rejection are made by compacting a microporous layer within a composite reverse osmosis membrane longitudinally along its lengthwise periphery. Means and method for causing longitudinal indentations in composite membranes during manufacturing operations are disclosed and described.