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:
Oct. 28, 1986
Filed:
Jan. 07, 1985
T Scott Kennedy, East Boothbay, ME (US);
Paul F Herman, Boothbay Harbor, ME (US);
Twin Rivers Engineering, East Boothbay, ME (US);
Abstract
A reticulated hydrophilic foam substrate and bonded active surface particle powder composite filter material is generated by foam polymerization of a prepolymer phase with an aqueous phase. The reticulated hydrophilic foam substrate is characterized by relatively low pressure drop and low resistance to flow through the foam substrate. The prepolymer phase is a hydrophilic polyurethane prepolymer receptive to the aqueous phase for foam polymerization upon mixing with the aqueous phase. The aqueous phase in turn is a pourable and flowable slurry mixture of water, active surface particle powder, and surfactant wetting agent. The aqueous phase includes sufficient water or other evaporable liquid to provide a protective liquid layer or coating over the active surfaces of the powder particles. Upon polymerization of the mixture the active surface powder particles are distributed over and bonded to the webs of the reticulated hydrophilic foam and the major portion of the active surfaces are free from obstruction and available for active filter functioning. The aqueous phase and prepolymer phase upon mixing may be poured, flowed, or injected into a suitable respirator or mask mold to provide a lightweight single piece respirator face mask.