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:
Mar. 04, 1991
Filed:
Sep. 13, 1989
John Weber, Oakland, CA (US);
Abstract
In asbestos abatement or decontamination work, negative pressure is established within a work area, and air entering the work area in response to the negative pressure is caused to pass through or past a HEPA filter in an air inlet to the work area. If the negative pressure within the work area ceases, as in an emergency situation, any air exiting the work area through the air inlet is caused to pass through the HEPA filter. This may be accomplished by pivotally mounting the HEPA filter for rotation about a horizontal axis so that it moves out of the way of inflowing air, while outgoing air must pass through the filter. Alternatively, a fan may also be mounted in the air inlet and may be operated in response to pressure within the work area, so that when a negative pressure condition exists within the work area the fan is operated to force air into the work area through the HEPA filter, while if the negative pressure condition terminates, the fan is turned off, so that any air exiting through the inlet must pass through the HEPA filter.