Abstract: A wall-mountable acoustic device for absorption of sound in an indoor area is constructed of self-supporting interbonded rockwool mat material. The primary component made of the mat material is shaped in semi-cylindrical configuration. End panels of rockwool mat of similar composition are attached to the opposite ends of the semi-cylindrical configuration to enclose the configuration except for an open rear extremity of rectangular perimeter. When attached to a flat wall, a totally enclosed semi-cylindrical chamber is defined. In a preferred embodiment, further improvement of sound absorption properties is achieved by way of a diaphragm disposed within the semi-cylindrical configuration.

Abstract: A panel which diffuses sound incident thereupon is provided having a rectangular perimeter and wedge-shaped configuration wherein the front surface of the panel is angularly disposed with respect to its flat rear surface. The front surface contains a series of parallel elongated depressions. A multitude of such panels are employed along with sound reflecting and sound absorbing panels to produce a wall-mounted assemblage of sound-interactive panels capable of desirably modifying the subjectively perceived quality of sound in a room or auditorium.

Abstract: A core for the production of a rectangular acoustic panel includes a mat of rockwool bounded by flat front and rear surfaces, and having a density between 5 and 9 pounds per cubic foot, a thickness between 0.75 and 2.0 inches, and a binder content between 3% and 5%. A sheet of non-woven interbonded fiberglass is adhered to at least one flat surface of the rockwool mat, the sheet having a thickness between 20 and 30 mils.

Abstract: An amphibious bicycle intended to be highly efficient, safe and maneuverable forms of both land and water transportation. This achieved by the addition of a strong, rigid frame work, small paddles in the rear wheel assembly, and durable, nonsinkable pontoons of high density styrofoam, made structurally strong and protected by linear outside structural supports sandwiching them. And finally, adding bracing at strategic points to effectively maintain the pontoons' land or water position.

Abstract: A self-supporting sound-absorbing panel intended to be attached to indoor walls and ceilings of buildings includes a core assembly made from a mat of rockwool having four straight perimeter edges disposed in a rectangular array, and sheets of non-woven interadhered fiberglass bonded to front and rear surfaces of the mat. A rigid rectangular frame surrounds and secures the core assembly. A cloth facing is tautly disposed upon the front surface of the panel, extends around the edges of the frame, and is bonded to the rear of the panel.