Abstract: A dust mop features a dust collector layer made of electrostatically charged nonwoven fabric. The electrostatic charge (a) enables the dust collector to be detachably mounted to the mop head by electrostatic cling; and (b) improves the dust collecting ability of the dust collector.

Abstract: A dust mop features a dust collector layer made of electrostatically charged nonwoven fabric. The electrostatic charge (a) enables the dust collector to be detachably mounted to the mop head by electrostatic cling; and (b) improves the dust collecting ability of the dust collector.

Abstract: A dust mop features a dust collector layer made of electrostatically charged nonwoven fabric. The electrostatic charge (a) enables the dust collector to be detachably mounted to the mop head by electrostatic cling; and (b) improves the dust collecting ability of the dust collector.

Abstract: Electrostatically charged nonwoven webs (fabrics) are used in displays, quilting, toys, and pattern making. The electrostatic charge causes the nonwoven webs to cling to cloth or paper without the need of pins or connectors. In pattern making the charged nonwoven web is detachably secured to a mastern pattern permitting the web to be marked and cut to form a specific sized pattern which is used to cut cloth in a selected size.

Abstract: A thermoplastic fabric for use as a support fabric in interfacing, underlining, and applique carries a persistent electrostatic charge that causes the fabrics in contact therewith to cling thereto in a nonslip relationship. This facilitates sewing of the layers together. The preferred support fabric is a nonwoven fabric such as meltblown and spunbonded fabrics.

Abstract: A device for detachably adhering a manipulative to a substrate using electrostatic charges is described. The invention comprises a thermoplastic substrate having imparted thereto a substantially persistent electrostatic charge with paper and/or fabric manipulatives removably adhered thereto by electrostatic attraction. The present invention may be useful for creating visual displays such as display boards, design boards for quilting patterns, sewing patterns, and toys such as dolls and educational games or aides using manipulatives in visual displays. The substrate is preferably made of polyolefin nonwoven webs, particularly polypropylene or polyethylene meltblown webs.

Abstract: A method of preventing overdisplacement and underdisplacement of proppant during well treatments to hydraulically induce and maintain a fracture in a subterranean formation traversed by a wellbore having a perforated casing. In the practice of the method, ball sealers are incorporated in the trailing end portion of a fracturing fluid-proppant slurry. The ball sealers have a density such that they do not sink in the slurry nor rise in the displacement fluid injected following the slurry. The ball sealers seat on at least some of the well perforations as the final portion of the slurry reaches the perforations. This causes the surface pumping pressure to increase, signalling the end of the treating operation. The detection of the time at which a selected portion of the injected fluid reaches the perforations allows the treatment to be terminated, minimizing proppant overdisplacement and providing for a fully packed fracture in the near-wellbore region.

Abstract: A method of preventing overdisplacement of propping agent particles during well treatments to hydraulically induce a fracture in a subterranean formation wherein buoyant or neutrally buoyant ball sealers are incorporated in the trailing end portion of the fracturing fluid. The ball sealers seat on at least some of the well perforations in final stages of particle injection thereby causing the surface pumping pressure to increase, signalling the end of the treating operation. This minimizes proppant overdisplacement and provides for a fully packed fracture in the near wellbore region.