Gte Products Corporation

Gte Sylvania Incorporated

Other

Osram Sylvania Inc.

Robert W Wolfe

Russell F Messier

Joseph J Cleveland

Carl W Fritsch, Jr

Joseph J Lenox

Dale E Wittmer

Harry O Schulze

James E Morse

Theodore J Tomlinson

A tennis court ball retainer having a horizontally extending ball gutter along the tennis court back wall which has an upwardly facing channel dimensioned to receive and retain tennis balls. An upright flexible upper backdrop curtain coextends directly above and along the ball gutter for engaging tennis balls striking the upper curtain, thereby dampening the tennis ball impact and directing the engaged tennis balls to fall into the ball gutter for retention. A tennis court floor surface ball retainer is also provided and coextends with and under the ball gutter. The ball gutter extends a uniform distance above the tennis court floor surface and includes an upright flexible lower backdrop curtain coextending below and along the ball gutter for engaging and trapping tennis balls striking this lower curtain by rolling or skidding on the tennis court floor surface. The lower curtain is draped to provide a sagging horizontal droop therein which is positioned a predetermined distance above the tennis court floor surface wherein this distance is dimensioned for thereby capturing and retaining tennis balls between the droop and the tennis court floor surface.

Tennis court ball retainer

A flux is described for making borate phosphors with a discrete particle morphology. The flux is comprised of a salt of barium, sodium, potassium, or a combination thereof. The discrete particle morphology permits the borate phosphors to be used directly without deagglomeration.

Method of making a borate phosphor having a discrete particle morphology

A stir-in fluorescent lamp phosphor is coated with a 1:1 ratio of latex polymer and fumed silica. The polymer-coated fluorescent lamp phosphor exhibits improved dispersability and wettability in aqueous and organic binder media which are used to apply fluorescent lamp phosphors to the inside walls of a fluorescent lamp envelope.

Stir-in fluorescent lamp phosphor and method of making same

A process is disclosed for pigmenting and coating a silver activated zinc sulfide phosphor and for imparting stir-in capabilities to the phosphor. The process comprises deagglomerating the phosphor, forming an aqueous slurry of phosphor particles, pigment particles, a binding agent which can be latex polymers or copolymers, the binding agent having a glass transition temperature of greater than about 20.degree. C. and a silica-based compound to produce a silica based coating on the phosphor particles, and agitating the slurry, separating the solids from the resulting liquor, and drying the solids at a temperature above the Minimum Film Formation Temperature of the latex to produce the phosphor particles wherein the pigment particles are bonded to them and wherein the pigmented phosphor particles are coated with the silica-based coating. The process comprises also pigmenting the phosphor and imparting stir-in capabilities thereto by the process as described above without adding the coating agent to the slurry. The process comprises also coating the phosphor and imparting stir in capabilities thereto by the above process without the pigments and binding agent.

Process for imparting stir-in capabilities to a silver activated zinc

A process is disclosed for binding pigment particles to phosphor particles which involves forming an aqueous slurry of phosphor particles, pigment particles, and a binding agent which can be latex polymers or copolymers, the binding agent having a glass transition temperature of greater than about 20.degree. C. and agitating the slurry, separating the solids from the resulting liquor, and drying the solids at a temperature above the Minimum Film Formation Temperature of the latex to produce the phosphor particles wherein the pigment particles are bonded to them.

Process for binding pigment particles to phosphor particles

A process is disclosed for bonding pigment particles to phosphor particles. The process involves forming a relatively uniform blend of a phosphor, one or more pigments, colloidal silicon dioxide, and water, with the amount of water in the blend being no greater than about 10% by weight, and heating the blend at a temperature of at least about 150.degree. C. to produce a pigmented phosphor having an overcoating of silicon dioxide.

An article is disclosed which is made of silicon nitride based material consisting essentially of in percent by weight about 6% yttrium oxide and the balance silicon nitride. The article has open porosity of from about 37% by volume at which level the strength of the article is about 15 ksi to about 10% by volume open porosity at which level the strength of the article is about 72 ksi. The article can have within its open porosity a lubricating material.

High strength, low mass porous silicon nitride based articles

A silicon nitride based cutting tool is disclosed consisting essentially of in percent by weight about 5% aluminum oxide, about 6% yttrium oxide, from about 1.5% to about 5.5% silicon dioxide, and the balance silicon nitride, and having a density of at least about 99% of the theoretical density.

Silicon nitride based cutting tool

In the manufacture of sintered silicon nitride articles by hot isostatic pressing, multiple silicon nitride parts are encapsulated within a single capsule for the pressing operation. Suitable spacers placed between the parts ease separation thereof after sintering.

Method for making sintered silicon nitride articles

In the manufacture of sintered silicon nitride articles by hot isostatic pressing, silicon nitride preforms are assembled in a stack with spacers between the preforms. The stack is completely enveloped in refractory metal foil and then encapsulated within a single capsule for the pressing operation.

Method of preparing silicon nitride articles for sintering

In the manufacture of sintered silicon nitride articles by hot isostatic pressing, silicon nitride preforms are assembled in a stack with spacers between the preforms. A plurality of such stacks are inserted in a glass tube closed at one end. The glass is melted around each stack to encapsulate each stack in a single sealed capsule.

Process for sintering silicon nitride articles

A blue emitting La Mg aluminate phosphor activated by Eu and having a multiphase structure, exhibits improved brightness over prior art single phase compositions, and also exhibits high maintenance, making such phosphor useful either alone or in combination with other phosphors in fluorescent lamps.

LaMg Aluminate phosphors activated by europium and lamps incorporating

Ce-substituted alkaline earth magnetoplumbite aluminate phosphors containing 15 to 50 mole percent of cations (exclusive of Al) as Ce exhibit intense relatively narrow band emissions between 320 and 350 nanometers, making such phosphors especially useful in applications such as therapeutic or cosmetic skin treatments, or the stimulation of chemical reactions.

Ultraviolet emitting Ce alkaline earth aluminate lamp phosphors and

This invention relates to a CeYMg Aluminate fluorescent lamp phosphor which emits ultraviolet radiation in a preferred region of the electromagnetic spectrum proven useful for the treatment of psoriasis. The phosphor in fluorescent lamps shows improved performance for this application over other phosphors known to the art.

Ultraviolet emitting CeYMg aluminate fluorescent lamp phosphor for

Low thermal expansion ceramics of essentially 100 percent cordierite solid solution are prepared by the devitrification of a glass frit compact having the nominal composition in weight percent 16 percent MgO, 30 percent Al.sub.2 O.sub.3, 54 percent SiO.sub.2. These ceramics exhibit adequate density and strength and are useful for example in the fabrication of gas turbine engine components such as rotor vanes and heat exchangers.

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Wysox, PA, United States of America

Robert W Wolfe