Respirator for only filtering air inhaled
Patent 5331957 Issued on July 26, 1994. Estimated Expiration Date: 
February 5, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 5, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 216171 2070241 2216619 2894508 3521630 Endoscopic fiberoptic fluorescence spectrometer Patent #: 4981138 InventorApplicationNo. 014355 filed on 02/05/1993US Classes:128/206.15, With gas flow control valve128/206.17With separate filter encircling element, or housing, securing filter on maskExaminersPrimary: Asher, Kimberly L.Attorney, Agent or FirmInternational ClassesA62B 007/10A62B 018/08 A62B 023/02 A62B 019/00 205.24 203.11 201.11 206.17 AbstractA respirator for only filtering air inhaled, which comprises a nose-cover portion and mouth-cover portion for covering a person's nose and mouth respectively; both sides of the two portions have lugs to be fastened together using a strap; each of the two portions has an exhausting hole without filter; the exhausting hole can be closed with a valve flap, and the exhausting hole can exhaust air only. The nose-cover portion includes an exhausting hole, which is mounted around with two layers of plastic nets; the upper plastic net can be lifted up to insert a gauze or a similar filter, which can be clamped between the two layers so as to provide the function of filtering air inhaled only.Field of SearchWith gas flow control valveFace mask covering a breathing passage Covering nose and mouth Particulate filtering Face mask covering a breathing passage Structure of means securing mask to head Closed air-filled passage adjacent mask edge (e.g., tubular bead, etc.) Mask/face sealing structure Having valve, or valve control, structure Gas supply means responsive to breathing With valve member flexing about securement Flap or reed | |
