Apparatus for controlling the flow of a foam uses a bellow enclosed in a housing. The bellows is filled with foam under pressure from a foam generator and expands a preselected amount at which point the flow of foam into the bellows is interrupted. Simultaneously with the interrupting of the flow of foam into the bellows, air under pressure is routed into the housing which causes the bellows to collapse forcing the foam out of the bellows. The apparatus is particularly useful in the froth flotat...

Catamenial appliance having a spring biased flexible ring insertable into the vagina of a female and over the cervix, attached to a collecting sheath to contain and direct menstrual flow. The collecting sheath protrudes from the vagina and is releasably attachable to a replaceable collector pouch containing leakproof internal reservoir means to receive and contain the menstrual flow. In alternate embodiments, the collecting sheath is provided with means to permit total intra-vaginal containment ...

Catamenial appliance having an outwardly spring biased flexible ring insertable into the vagina of a female and over the cervix, attached to a closed collecting sheath to contain and direct menstrual flow. The collecting sheath protrudes only slightly from the vagina yet will still permit total intra-vaginal containment of menses. In alternate embodiments, the distal end may be provided with means to permit emptying of menses without removal of the ring and sheath.

A router attachment which is particularly useful for cutting the slots to receive standard biscuits used in biscuit joinery.

A hard, relatively non-brittle, cemented carbide body is made by sintering pressed grade carbide powders in the presence of a boron-containing material such as boron nitride. During sintering, appreciable quantities of boron migrate or diffuse into the body to become incorporated throughout the microstructure of the carbide resulting in the formation of a third quarternary phase comprised of tungsten, cobalt, boron and carbon.

Apparatus utilizing change in pressure condition in an area to be protected to indicate intrusion or change in conditions of the area by using a pressure detection device to detect pressure waves at low and infrasonic frequencies which includes a pressure transducer sensitive to change in pressure to provide an output signal. In some instances an amplifier is provided to amplify the output signal, a signal conditioning circuit is provided to delay a portion of the signal, and a detector device i...

A dedicated calculator for performing arithmetic operations on dimensioned quantities, particularly those in the English units of feet, inches and fractions of inches. The calculator keyboard includes a plurality of conventional algebraic calculator keys as well as dedicated keys for entry of values in inches and fractions of inches. A display provides formatting according to the mode of operation and the result. The calculator operates in modes for displaying feet, inches, and fractions of inch...

A reed-type game call which can be operated by blowing and sucking on a single end of the call. This permits a caller to make one type of sound when blowing out through the call, and a different or same sound when sucking in, thus allowing for rapid sound successions. This permits the caller to sound like a whole flock of geese, or ducks with the rapid varied sound; it also permits a hyperventilating deer sound.

A synthetic leather-like material includes a woven fabric base, an acrylic paint layer over the fabric, a clear polymer layer over the paint, and a silicone layer over the polymer.

A blast joint for use with a snubbing unit includes a casing around the protective rings and means for sealing around the bottom of the rings between the tubing and the casing.