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:
Jan. 23, 1979
Filed:
Dec. 27, 1977
Marvin L Peterson, Ponca City, OK (US);
Donald H Oertle, Ponca City, OK (US);
Continental Oil Company, Ponca City, OK (US);
Abstract
This invention provides a method for monitoring early formation of cracks in permeable or porous materials which comprises affixing a frangible fluid impermeable enclosure to the permeable or porous surface to be monitored such that a crack forming in the permeable material will destroy the integrity of the frangible fluid impermeable enclosure and provide a passage for a fluid to flow between the environment and the enclosed space, then sealing a fluid passageway in fluid communication from the enclosed space to a source of pressure different than ambient at the permeable material and to a pressure sensor; then imparting a pressure different than ambient to the enclosed space through the fluid passageway and thereafter monitoring the internal pressure in the enclosed space and fluid passageway with a pressure sensor such that a crack in the permeable material will destroy the integrity of the enclosed space and allow passage of fluid between the environment and the enclosed space which is detected by the pressure sensor.