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. 17, 2008
Filed:
Mar. 15, 2001
Applicants:
Arne Olay Fredheim, Trondheim, NO;
Pentti Paurola, Hafrsfjord, NO;
Inventors:
Arne Olay Fredheim, Trondheim, NO;
Pentti Paurola, Hafrsfjord, NO;
Assignee:
Den Norske Stats Oljeselskap A.S., Stavanger, NO;
Primary Examiner:
Int. Cl.
CPC ...
F25J 1/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention relates to a natural gas liquefaction process and particularly to one suited to use offshore. The invention provides a natural gas liquefaction apparatus wherein a carbon dioxide based pre-cooling circuit is provided in a cascade arrangement with a main cooling circuit. The invention also extends to a natural gas liquefaction apparatus wherein a main cooling circuit uses as a refrigerant a gas stream, at least a portion of which is derived from a raw natural gas source.