Abstract: Methods of and apparatus for preparing gas-filled liposomes are described. Gas-filled liposomes prepared by these methods are particularly useful, for example, in ultrasonic imaging applications and in therapeutic drug delivery systems.

Abstract: An expandable hose that reduces the hammering produced in hydraulic systems by pumps. A tubular outer section of flexible material has a fitting at each end and loosely accommodates a tubular inner section of flexible material, leaving a hollow space between them. One end of the inner section communicates with one of the fittings, allowing fluid to flow through it, whereas the other end is free and open. A fluid-conveying channel is left between the free end of the inner section and the other fitting. There is a constriction between the inner section and the outer section that separates the tubular channel from the fluid-conveying channel. The wall of the inner section is solid in the vicinity of the tubular channel, so that fluid can enter the tubular channel from the fluid-conveying channel only by way of the constriction. The position of the constriction dictates the ratio of the capacity of the tubular channel to that of the fluid-conveying channel in terms of frequency.

Abstract: An intervertebral disk endoprosthesis is filled with an elastic material and provided with cover plates at its end faces, and has a circular or elliptical corrugated tube surrounding the viscoelastic material, the tube being terminated by cover plates.

Abstract: An attachment is provided for allowing a chain saw sharpener to be used for filing the depth gauge portions of the cutting links on the saw chain. The sharpener is of the type comprising a sharpener body in the form of an inverted U-shaped channel-defining member adapted to be placed over the bar of a chain saw, and a rotary burr with an abradant end portion which is receivable in a selected one of two horizontal guide bores provided in the sharpener body. The depth gauge attachment comprises an elongated gauge bar and means for removably affixing the gauge bar within the upper portion of the sharpener body channel so that the gauge bar occupies only a portion of the channel length.

Abstract: A portable chain saw sharpening kit comprises a sharpener body in the form of an inverted U-shaped channel-defining member adapted to be placed over the bar of a chain saw, a rotary burr with a tapered abradant end portion which is receivable in a selected one of two horizontal guide bores provided in the sharpener body, and an alignment pin which is likewise receivable in a selected one of the two guide bores. The alignment pin comprises a shank portion and a reduced end portion, the latter providing an abutment surface for positioning a cutting link within the sharpener body channel in the proper position for sharpening. The shank portion and reduced end portion of the alignment pin are preferably cylindrical and have different diameters, with the reduced end portion being eccentrically offset from the shank portion and having a diameter substantially equal to the widest diameter of the tapered abradent end portion of the rotary burr.

Abstract: An attachment is provided for allowing a chain saw sharpener to be used for filing the depth gauge portions of the cutting links on the saw chain. The sharpener is of the type comprising a sharpener body in the form of an inverted U-shaped channel-defining member adapted to be placed over the bar of a chain saw, and a rotary burr with an abradant end portion which is receivable in a selected one of two horizontal guide bores provided in the sharpener body. The depth gauge attachment comprises an elongated gauge bar and means for removably affixing the gauge bar within the upper portion of the sharpener body channel so that the gauge bar occupies only a portion of the channel length.