Abstract: Described herein is an acoustic ceiling panel comprising: a first air-permeable body comprising a first major surface opposite a second major surface and a side surface extending between the first and second major surfaces, the first body having an NRC value of at least 0.5 as measured between the first and second major surfaces of the first body; and an attenuation coating applied to the second major surface of the body and the side surface of the body, whereby the attenuation coating seals at least a portion of the second major surface and the side surface of the body.

Abstract: Described herein is an acoustic ceiling panel comprising: a first air-permeable body comprising a first major surface opposite a second major surface and a side surface extending between the first and second major surfaces, the first body having an NRC value of at least 0.5 as measured between the first and second major surfaces of the first body; and an attenuation coating applied to the second major surface of the body and the side surface of the body, whereby the attenuation coating seals at least a portion of the second major surface and the side surface of the body.

Abstract: Described herein is an acoustic ceiling panel comprising: a first air-permeable body comprising a first major surface opposite a second major surface and a side surface extending between the first and second major surfaces, the first body having an NRC value of at least 0.5 as measured between the first and second major surfaces of the first body; and an attenuation coating applied to the second major surface of the body and the side surface of the body, whereby the attenuation coating seals at least a portion of the second major surface and the side surface of the body.

Abstract: Described herein is a ceiling system comprising: a support grid; a first panel mounted to the support grid, the first panel comprising a first body formed of a fibrous material; a second panel mounted to the support grid, the second panel comprising a second body formed of a sound attenuation material; whereby the first and second panels are supported by the support grid such that a vertical gap exists between the first panel and the second panel such that the first and second panels are not in direct contact.

Abstract: Described herein is an acoustic ceiling panel comprising: a first air-permeable body comprising a first major surface opposite a second major surface and a side surface extending between the first and second major surfaces, the first body having an NRC value of at least 0.5 as measured between the first and second major surfaces of the first body; and an attenuation coating applied to the second major surface of the body and the side surface of the body, whereby the attenuation coating seals at least a portion of the second major surface and the side surface of the body.

Abstract: A decorative moulding is provided to form pre-mitered corners. Two moulding pieces are provided each with both edges cut at a 45.degree. angle. One moulding piece is cut with a 45.degree. angle to the right and the other moulding piece is cut with a 45.degree. angle to the left. By matching up the angled ends of the decorative moulding, either an inside pre-mitered corner or an outside pre-mitered corner can be formed.

Abstract: A stencil plate is made by an electroplating process rather than a steel fabricating process. A resist material and a film were placed upon a matrix and by using conventional photoresist operations, a resist coating is formed on the matrix in the shape of the apertures to be formed in the stencil plate. Metal is electroplated on the upper surface of the matrix and around the shaped resist material forming a stencil plate.Subsequently, another resist coating may be placed over the first plated material and openings are formed in the second resist material. Upon a subsequent plating operation, these openings are filled with a plating material and this provides a color dams structure around the openings in the originally formed stencil plate.

Abstract: A rotary printing screen is made with selected areas being provided with a perforated mesh region through which printing ink may be passed. These mesh areas are provided with a mesh pattern recessed back from the exterior surface of the rotary printing screen so as to permit greater ink deposition thicknesses. The screen is formed by an electro-metal deposition method which provides a basic conventional screen structure. The mesh areas are then masked and an additional deposition of material is provided in the non-mesh areas to build up these areas and, consequently, provide a recessed area in the region of the originally formed mesh design.

Abstract: The invention is directed to a technique for the generation of film negatives which will be used in a chemical etching process to provide a previously etched surface with texturing on the broad, flat areas of a previously etched surface. A rubbing is used to form a basis for a series of photographic negatives which provide an indication of the different levels of texturing.