To provide a compact ozone generator, films of polymeric material are employed as dielectrics in combination with flat, planar electrodes to... Show moreTo provide a compact ozone generator, films of polymeric material are employed as dielectrics in combination with flat, planar electrodes to produce ozone by silient electrical discharge in an oxygen containing gas stream. The electrodes and dielectrics are cooled by the gas stream which is recycled across the electrodes and dielectrics and through an external heat exchanger. Sponsorship: IIT Research Institute United States Patent Show less
A blank for forming a stencil screen for silk screen or electrostatic stencil printing is disclosed. The screen includes a resilient, high... Show moreA blank for forming a stencil screen for silk screen or electrostatic stencil printing is disclosed. The screen includes a resilient, high tensile strength, porous substrate such as a monofilamentary nylon or stainless steel 200-mesh screen. A light radiation absorbent, self-combustible, ink-resistant, ink-impervious and tough film is applied to the screen, suitably a combustible black nitrocellulose film or a black cellulose ether film containing finely dispersed nitrate or perchlorate. The film is selectively removed by directly pulsing high-intensity light of over 10 joules per square inch for a short duration of 1 to 50 milliseconds in the form of an image pattern to ignite and completely combust the film only in said areas during the duration of the pulse. Sponsorship: IIT Research Institute United States Patent Show less