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:
Feb. 25, 1992
Filed:
Oct. 09, 1990
Jean-Luc Hubert, Willowbrook, IL (US);
Liquid Air Corporation, Walnut Creek, CA (US);
Abstract
To remove a thick insulating coating from a steel pipeline, with high efficiency and speed, multiple cooling and scraping steps are performed sequentially. In a first cooling step, a low temperature coolant is sprayed onto the coating for a time sufficient to cool only a portion of the coating to a temperature below the embrittlement temperature thereof. After scraping away the embrittled outer layers of the coating, subsequent cooling and scraping steps are performed until all of the coating has been embrittled and removed. It has been found that the time required for removing the coating by use of such multiple spraying and scraping steps is substantially less than that where the coating is to be embrittled in a single step.