A method and apparatus are disclosed for maintaining a predetermined separation between the walls of light valves, especially when the pressure on the inside of the walls may be less than the pressure on the outside of the same walls (atmospheric pressure). To maintain this separation, a plurality of small chemically inert, non-deformable beads are added to the fluid suspension in the light valve. These beads which have at least one dimension which is the same as the desired spacing between the ...

There is provided improved physiologically acceptable articles made from various fluorocarbon polymers and a process for maintaining the normal integrity of the blood of warm-blooded animals with said articles. The physiologically acceptable articles include specific medial devices such as catheters, etc., useful in contact with blood or tissue in warm-blooded animals.

A cover is provided for use in combination with a receptacle for coffee. The cover is utilizable in a receptacle having a circular, horizontal cross-section and rests on the top of the surface of the coffee in the receptacle. The cover comprises a circular disc having a radially extending slit which extends from the center of the disc to the periphery thereof to enable an overlapping of the portions of the disc on opposite sides of the slit but adjacent thereto. The disc has a larger diameter th...

A modified alkaline peroxide pre-bond process for the surface treatment of titanium is useful as a practical production process. In this modified process, an exceptionally wide range of allowable peroxide concentration, namely, from 0.001 molar to 0.2 molar (and preferably 0.001 molar to 0.01 molar) may be tolerated and a novel real-time peroxide monitoring and control technique is employed. The process is further improved by means of the use of stabilizers such as precipitated magnesium silicat...

A swinging mechanism for maintaining pendular movement in a swing. A revolving plate is provided which engages a propulsion member on the swing so as to apply torque to the swing during part of the swing cycle, maintaining pendular movement of the swing despite energy loses due to air friction and the like. Switches are provided to activate rotation of the revolving plate when the swing has reached a rear position, and to continue movement of the revolving plate to return it to a neutral or orig...

In a process wherein a resinous coating is formed on a ferriferous surface by immersing the surface in an acidic aqueous coating composition prepared from dispersed particles of resin, HF and FeF.sub.3, wherein said composition forms on said surface a resinous coating which increases in thickness the longer the surface is immersed in the composition and wherein as the composition is used to coat additional surfaces, it begins to form thinner coatings or it destabilizes, the improvement comprisin...

A method for ensuring that sufficient liquid is maintained in a liquid reservoir which is distant from a liquid supply station, comprising periodically determining the amount of liquid in the reservoir and sending the periodic determinations to a signal receiver for determination of the actual usage rate of liquid from the reservoir, sending a signal from the receiver to a remote supply station if certain defined mathematical operations indicate that liquid resupply is needed, and sending liquid...

In order to maintain the shape of a hole, such as a grave, dug in the ground, an inflatable bag is lowered into the hole and then inflated to a low pressure so as substantially to fill the hole, thus maintaining the sides of the hole against subsidence and also largely preventing water seeping into the hole. A protective cover is then placed over the hole and means are provided for anchoring this cover to the bag itself, which is wedged against the sides of the hole.

A resilient ring is provided as an attachment to fit around the barrel of a winch for jamming the end turn of a loaded rope wound around the barrel against the adjacent turn thereby obviating the need to apply manual tension to the tail of the rope.

The position maintaining tool is keyed to the control arm intermediate the arms of a bushing supported A-frame in the front suspension system of a vehicle and maintains the A-frame arms positionally fixed upon the control arm during replacement of the bushings.