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:
Aug. 28, 1990
Filed:
Aug. 29, 1988
George H Bowser, New Kensington, PA (US);
Stanley J Pyzewski, Cheswick, PA (US);
PPG Industries, Inc., Pittsburgh, PA (US);
Abstract
A multiple-glazed window unit comprises a pair of glass sheets held in spaced relation to each other by a spacer and sealant assembly defining a sealed, insulating airspace between the sheets. The surface of the sheets facing the airspace has a protective surface. The spacer and sealant assembly is free of any desiccant. If desired, an opening may be provided through the spacer and sealant assembly to put the airspace in communication with the atmosphere external to the unit. In the stance where opposed openings are provided, and sized and configured to allow free movement of atmospheric air and water vapor molecules through the airspace to equalize airspace pressure and relative humidity with that of the external atmosphere, the protective surface is not needed. A filtering element is employed to minimize infiltration of liquid water, dust, dirt, and the like through the openings and into the airspace. The unit also comprises a sash retaining the unit within a structural opening. The protective coating on the interior surface of the glass sheets and the openings provided a multiple-glazed unit that does not have a desiccant material and has the interior surfaces free of haze.