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:
Jul. 22, 1997
Filed:
Jun. 20, 1996
Norman J MacDonald, III, Lunenburg, MA (US);
PNM, Inc., Boxboro, MA (US);
Abstract
A shroud for use with a sprinkler assembly in a corrosive environment comprising a secondary bag surrounding the sprinkler head to protect it from the corrosive environment for a minimum period of time, a ribbon-shaped corrosion sensor located adjacent to the outer surface of the secondary bag that corrodes apart to electrically trigger an alarm before the ability of the secondary bag to protect the sprinkler head fails, a primary bag surrounding the secondary bag and the sensor to protect them from the corrosive environment for a minimum period of time, a pair of gaskets with an opening for the sprinkler head, the bags extending through the opening of one of the gaskets and annular skirts extending from the edge of the bag openings being sandwiched between the gaskets and held together by a pressure-sensitive adhesive, the bags melting at a temperature that is higher than the normal temperature of the corrosive environment and lower than the temperature at which the sprinkler head activates.