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:
Nov. 15, 1988
Filed:
Jul. 06, 1987
Norman B Rice, Cuyahoga Falls, OH (US);
Other;
Abstract
Cryogenic process and apparatus for removing adherent coatings or linings from metallic substrates, especially the interiors of metal vessels or pipes. In one embodiment, a metal vessel having a polymeric interior lining is pressurized to about 900 psi, and the lining is contacted with a cryogenic liquid, preferably carbon dioxide, while this pressure is maintainted. The pressure is high enough so that the cryogenic liquid does not boil. The lining is then subjected to shock by ultrasound, for example. This causes the lining to break up into small particles and fall off the metal substrate. These particles, suspended in the cryogenic liquid, are removed from the pressure vessel and separated from the cryogenic liquid, which can be reused. In another embodiment, the cryogenic liquid is injected into a pipe having an adherent mineral deposit while maintaining a pressure of about 700 psi. A stream of cryogenic liquid containing suspended mineral particles is removed from the pipe.