Abstract: A process for doping laser dyes into plastic hosts is disclosed. This process allows the control of the doping profiles in order to achieve profiles, other than uniform, necessary for effective laser mode control, volumetric pumping, and stable resonators and oscillations during transverse pumping. In addition to the above-stated attributes, this process enables the production of dye impregnated plastics which lase at extended light wave lengths.Dye impregnated plastics, prepared in accordance with this process, exhibit electro-optical characteristics previously unattainable with plastics prepared via conventional prior art processes.

Abstract: The present invention is directed to a novel class of polynitrile (polycyano) substituted polyimide oligomers and the polyamic acid or ester precursors thereof. The nitrile groups on the oligomers allow the compounds to be cured through addition reactions which result in little or no outgassing. In addition, these oligomers are curable with heat in the presence of catalysts such as those which induce cyano trimerizations. The fully cured polyimides derived from these oligomers have excellent thermal and mechanical properties at high temperatures.

Abstract: I have discovered a process for making nitroarylacetylenes and aminoarylacetylenes in which the aryl radical is a phenylene radical or a diphenylene radical. With the exception of p-aminophenylacetylene, the compounds produced by this process are novel. The compounds are all useful as intermediates in the preparation of addition polymers utilizing a polymeric backbone of polyimides. The addition polymers are useful as adhesives and as laminating resins.

Abstract: An improved fluorescent light fixture having a multiple disc pivot joint tensioning system and a pretensioned second pivot joint system, both of which provide the capability of maintaining a uniform light intensity on a working surface is disclosed. The light fixture is also capable of maintaining its orientation with respect to the working surface on which it is mounted independently of the attitude orientation of the working surface.

Abstract: A crucible adapted for receiving crystal growth starting materials and exposing them to a reactive atmosphere under a carefully controlled temperature environment is disclosed.

Abstract: A dianhydride is converted into an alcohol-soluble di-ester and subsequently used to form a lacquer with a mixture of a diamine and an aminoarylacetylene. When the solvent is removed and the mixture of compounds is heated to a curing temperature a cured acetylene-end-capped polyimide polymer is produced.

Abstract: A new class of copolymers obtained via copolymerizing diethynylbenzene with an ethynyl substituted polyimide oligomer has been developed. The copolymers are thermosetting in character and are particularly useful for the fabrication of composite structures such as glass fiber reinforced laminates and molding compounds and graphite fiber reinforced laminates and molding compounds having zero void content.

Abstract: A new, useful and nonobvious process is disclosed wherein vapor phase controlled stoichiometry is employed to obtain compound semiconductor films having large crystallite textures. The process has been found to be particularly useful in the formation of compound semiconductor films where one of the components is a high vapor pressure element and the substrate material is amorphous.

Abstract: A series of bracs sized to fit louvre and jalousie glass panes when fitted with a latching unit provides an excellent security or locking device for windows.

Abstract: A device for use in a conventional book case to eject a book upon demand.

Abstract: An improved package for photopolymerized recording materials is disclosed. The package consists essentially of a cover plate, a substrate spaced apart from said cover plate, at least one of the said cover plate or said substrate having a coating on an internal surface of a photopolymerizable compound or a catalyst therefore, and fluid ingress means for introducing fluid into the space between said cover plate and said substrate. In a particularly preferred embodiment the ingress means is associated with a collapsible vessel located outside the basic package. Also disclosed are methods for using the package such as in holographic nondestructive testing.

Abstract: Composite materials are disclosed which consist of extensible polymer matrices in combination with three-dimensionally structured, interconnected fibrous masses which are formed "in situ". These composites exhibit novel mechanical characteristics which are distinctly different from those exhibited by conventional fiber-filled elastomers.

Abstract: A method for aligning nematic liquid crystals on a coated substrate is disclosed. The method involves a pretreatment of the coated substrate with a mixture of a long chain alcohol and an amine at elevated temperatures. Liquid crystals applied to substrates treated by this process undergo orientation such that their directors are aligned perpendicular to the surface of the coated substrates.

Abstract: This invention is directed to liquid crystal mixtures which have an extended operating range and require a low operating voltage. They are white in color and stable to atmospheric oxygen, moisture, and light. Because of their superior properties, they are useful in electro-optical displays, especially in liquid crystal watches and pocket-size calculators.

Abstract: A new system of epoxy resins and curing agents is disclosed which may be cured at low temperatures to yield polymeric materials capable of providing excellent binders for filled systems. The new combination exhibits a useful pot life, and cures at low temperatures to form a tough, dimensionally stable polymer.

Abstract: A security device for louvered windows has been disclosed. This device consists of a bar having four clips and is adaptable to almost all louvered windows having aluminum hardware. When attached properly, it precludes the removal of glass slats from the window and makes it impossible to open the window without breaking out the glass.

Abstract: We have discovered that alkali halides may be purified, particularly of trace anionic and cationic impurities, by scrubbing a melt of the alkali halide with gaseous nascent halogen. The halide radical of the gaseous nascent halogen preferably corresponds to the halide radical of the alkali halide. The purified material may then be used to form single crystals from which laser windows may be produced.