Martin Marietta Corporation

Lockheed Martin Corporation

Craig A. Matzdorf

Maher E. Tadros

Tushar K. Shah

Maher E Tadros

Terrance L Worchesky

Wenpeng Chen

Kenneth J Ritter

Shekhar Guha

Keith Kang

John D Venables

Brian M Ditchek

Christopher A Kadoch

James A Mason

Craig A Matzdorf

Tushar K Shah

An optical memory material includes a two-photon storage component which can be written from a first to a second state in response to WRITE light, mixed with a signal component which fluoresces by one-photon absorption only at the written locations in response to READ light. The storage material may be a fulgide. The memory material may also include a frequency upconversion material to aid writing. Writing is performed by a spatial light modulator (SLM) with a dynamic focussing system, for concentrating sufficient power at WRITE locations for nonlinear two-photon absorption. Crosstalk is avoided during simultaneous writing in some embodiments, by spacing the individual WRITE beams apart by an integer number of inter-beam spacings, so that non-adjacent datels are written simultaneously in a 'paragraph,' and the non-written areas are written at a different time with different paragraphs. The memory material may be translated relative to the SLM to access different paragraphs, or accessed by an electronically sparsed SLM. Reading uses a sheet of READ light traversing the pages of written material to cause the signal component to fluoresce, and imaging the fluorescent pattern onto a detector array. The memory material may be stacked in layers, spaced apart by light waveguides, for guiding the READ beam to the page to be read. In another embodiment, writing and erasure are performed by a modulated quasi-one-dimensional sheet of light, intersecting a second, unmodulated sheet of light at a column within the memory material.

Optical volume memory

An improved working electrode for use in display devices is disclosed. The working electrode comprises a transparent metal grid having a coating of metal oxide thereon. Suitable metal grids include Cu, Au, Ag, Al, Pt, Ni and Zn, while suitable metal oxide coatings include In.sub.2 O.sub.3, SnO.sub.2 and indium tin oxide (ITO). The display devices preferably include an electrochromic material comprising an aqueous solution of an electrochemically depositable metal. Display devices in which the present working electrode is used possess favorable characteristics such as rapid response times, wide dynamic range, high transmittance and improved uniformity. The devices are particularly suitable for large surface area applications.

Oxide coated metal grid electrode structure in display devices

Smut may be removed from the surface of aluminum or aluminum alloys by a deoxidizer comprising nitric acid, a halate salt, and, optionally, an activator.

Nonchromate deoxidizer for aluminum alloys

It has been found that hydration of aluminum oxide surface coatings to aluminum hydroxide may be curtailed by the presence of corrosion inhibiting amounts of amino phosphonate compounds. Effective inhibitors, such as nitrilotris (methylene) triphosphonic acid, may be applied to aluminum substrates having aluminum oxide surfaces thereupon in concentrations of less than 50% by weight in aqueous solution, and suitably from 1 to about 500 ppm.

Durability of adhesively bonded aluminum structures and method for

In the process of removing oxides of sulfur from gases, comprising the step of contacting, at 2.degree.-100.degree. C., components comprising water, calcium ions, and sulfite ions or bisulfite ions to form a sludge, the improvement comprising contacting said components in the presence of dissolved Graham's salt or a dissolved polymer of the formula M.sub.x P.sub.n O.sub.(3n+1) to form a sludge having improved properties, wherein M is a cation, n is a positive integer greater than 1, x is (n+2)/y, and y is the valence of M. Resulting sludge and new composition of matter, comprising lime or limestone mixed with Graham's salt or M.sub.x P.sub.n O.sub.(3n+1), which is useful in performing the process, are also disclosed.

Product comprising lime or limestone and Graham's salt or M.sub.x P.sub.n

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Ellicott City, MD, United States of America

Maher E Tadros