Abstract: A magnetic recording medium comprises a substrate coated with a magnetic composition comprising a cobalt adsorbed iron oxide powder with a phosphoric ester type anionic surfactant at a ratio of 2 wt. % or more and a binder at a ratio of said iron oxide powder to said binder of 4 or more.A magnetic recording medium has a coercive force Hc of 950 to 1200 Oe and a residual magnetic flux .phi..sub.r of 0.35 to 0.6 maxwell.

Abstract: A magnetic recording medium is provided which has smooth and stable running performances and is free of "squeal" phenomenon, especially in an environment of high temperature and high humidity. A highly viscous silicone oil having a viscosity of 100,000 centistokes or more is incorporated in combination with a higher fatty acid ester composed of a higher fatty having a melting point of 44.degree. C. or more and a monohydric alcohol containing 3 to 8 carbon atoms into a magnetic coating layer of the magnetic recording medium. Such silicone oil is represented by the general formula: ##STR1## wherein R is CH.sub.3, R' is CH.sub.3, C.sub.6 H.sub.5 or F and n is a number which determines a viscosity thereof. Such higher fatty acid ester is selected from butyl myristate, butyl palmitate, propyl stearate, butyl stearate and the like.

Abstract: A magnetic recording tape comprising a polyethylene terephthalate substrate and a magnetic material-containing layer closely adhered onto the substrate, which tape exhibits a reduced envelope variation. The polyethylene terephthalate substrate satisfies the formula:0.051H.sub.1 -0.59A+0.14 .DELTA.n+0.0015 (H.sub.2 -66.67).sup.2 +50.92.ltoreq.20wherein A is the average particle size of the polyethylene terephthalate crystals as determined from the half height width by X-ray diffractometry, and H.sub.1 is the average number of projections present in a unit area of 1 mm.sup.2 on the surface of the substrate, which projections have a height falling within the range of from 0.27 to 0.53 micron, H.sub.2 is the average number of projections similar to H.sub.1 above but having a height falling within the range of from 0.54 to 0.80 micron, rather than 0.27 to 0.53 micron, and .DELTA.n is the birefringence of the substrate.

Abstract: An improved magnetic tape cassette and separation sheet therefor. The separation sheet, positioned between an inner wall and the tape reels of a cassette, is formed with at least one dome-like protrusion. A plurality of such protrusions are preferably utilized spaced throughout the sheet, each of a diameter R and height H sized to provide an R/H ratio of between about 100 and 10. The separation sheet may be formed with a protrusion shaped to fit into a window in an inner case wall, the window-fitting protrusion extending from a side of said separation sheet opposite from that containing said dome-like protrusions.

Abstract: Catalysts for purification of exhaust gases from internal combustion engines which are a mixture of aluminum oxide, calcium oxide and one or more of the elements platinum, palladium and rhodium, and method for their use.

Abstract: An improved high voltage ceramic capacitor is disclosed which includes a ceramic body having electrode layers formed on opposite sides thereof. Novel terminals formed of material having a coefficient of expansion which is the same as, or nearly the same as, the material of the ceramic body are bonded to the electrode layers to prevent voids resulting from thermal stresses.