Abstract: A portable room security alarm features a smoke detector alarm, a motion sensing intrusion alarm, a temperature sensing alarm, and a digital display alarm clock. The security alarm includes a deployable thermally conducting mounting clip for mounting the alarm at the top of a door with the clip extended to pass around the upper edge of the door. A deployable temperature sensor probe may be attached to the clip to give early warning of a fire outside the door. The temperature probe may alternatively be attached to other metallic structures passing through the door frame, e.g. door knobs, hinges, etc. Large ventilating apertures in an extensible telescoping housing allow access of smoke to the smoke sensor, and with the housing closed the sensor is sealed off against long term contamination.

Abstract: An audio magnetic recording medium includes a magnetic material carrier backing and a layer of a magnetic material thereover comprising magnetic particles dispersed in a binder, the magnetic particles having a thin coating thereon of a rare earth-containing material, preferably samarium pentoxide. The amount of the rare earth-containing material in the recording medium is only a small percentage by weight of the coated magnetic particles so as not to adversely effect the erasability of the magnetic record to be recorded, but is of sufficient amount to improve the frequency response, signal to noise ratio, or channel separation characteristics thereof.

Abstract: A television picture projection screen unit comprises a screen support framework having an initially exposed projection screen surface upon which is to be projected a greatly enlarged image of the picture on the front face of a television set cathode ray tube. The screen support framework has opposite marginal portions positioned outwardly of the portions of said projection screen which are to receive the projected image. A flexible ornamental cover unit is provided comprising an ornamental, projection screen-covering portion having an ornamental face of a size to extend at least between said opposite marginal portions of the screen support framework so as to hide the projection screen from view when the projection screen is not in use. The cover unit has anchoring portions at the opposite ends thereof for anchoring the cover unit in a smooth, stretched condition over the marginal portions of the screen support framework.