Proctor, Michelle2019-12-022019-12-022015-10-13US Pat# US9155923B2http://hdl.handle.net/10342/7560Portable personal respiratory protection devices include a self-contained head gear member with a chin collar that has a front segment that defines a mouth portion and attaches to a back segment that resides over ears of a user and extends about a lower back segment of a head of the user. The head gear includes a visually transmissive face mask extending upwardly from the front segment of the chin collar that, in position, sealably engages a face of the user. The head gear has an open upper portion residing between an outer upper perimeter of the face mask and the back segment of the chin collar that, when worn, is adapted to expose a top and upper rear portion of a head of the user to environmental conditionsen-USagriculturerespiratoryinventionPatent