The Boeing Company

Ronald R Stephenson

Hyman R Lubowitz

Clyde H Sheppard

Joseph H Osborne

Kenneth A Krienke

Larry K Olli

Kay Youngdahl Blohowiak

Michael Strasik

Brad Lee Kirkwood

Thomas S Luhman

A method of evaluating a coating applied to a surface comprises the step of applying the coating to the surface. The coating including a conversion gel to chemically bind the surface and an indicator substantially uniformly distributed throughout the coating wherein the indicator modifies an appearance of the coating. The method further comprising the step of determining whether the indicator is present on the surface at a substantially uniform concentration.

Colored coating and method

A composition for coating a surface includes a carrier and an indicator distributed throughout the carrier. The indicator is configured to modify an appearance of the coating. The indicator facilitates determining a thickness of the coating in response to the appearance of the coating.

Colored coating and formulation

A water-based oligomer adhesion promoter material that promotes adhesion of paste adhesives used for structural bonding of metal components. The water-based system provides a convenient, one-step ambient cure process that minimizes the use of hazardous solvents. Reinforced metal substrates using the adhesion promoter material in conjunction to an ambiently cured paste adhesive offer significant improvement in terms of fatigue resistance. When used in repairing metal substrates having fatigue cracks, the adhesion promoter in conjunction with an ambiently cured paste adhesive minimizes fatigue crack propagation, thereby increasing the usable life of the metal substrate in strength bearing applications.

Silane triol capped expoxy-amine adhesion promoter for adhesive-bonded metal substrates

A process is provided for preparing solid superconducting mixed-metal oxides whereby the superconductor can be formed into any predetermined shape by way of viscous sol precursors. The superconductors are also formed by this process into homogeneous phases.

Method for producing superconducting oxide compounds

The yield of fully substituted, multidimensional aromatic hubs in the condensation of hydroxyl and acid halide functionalities is improved by adding a thallium catalyst, such as thallium ethoxide (Tl-OC.sub.2 H.sub.5), in the solvent.

Multidimensional polyesters

The yield of fully substituted, multidimensional aromatic hubs in the condensation of hydroxyl and acid halide functionalities is improved by adding a thallium catalyst, such as thallium ethoxide (Tl--OC.sub.2 H.sub.5), in the solvent.

Thallium catalyzed multidimensional ester oligomers

The yield of fully substituted, multidimensional aromatic hubs in the condensation of hydroxyl and acid halide functionalities is improved by adding a thallium catalyst, such as thallium ethoxide (T1-OC.sub.2 H.sub.5), in the solvent.

Method of making multidimensional polyesters

A La.sub.1-x Sr.sub.x Cr.sub.1-y Mn.sub.y O.sub.3 ceramic oxide gel obtainable by the process comprising the steps of:

Ceramic oxide compounds

A process is provided for preparing ceramics which can be produced into any predetermined shape by way of gel precursors.

Method for producing ceramic oxide compounds

The thermooxidative stability and thermomechanical properties of advanced composites which use high performance resin matrices such as polyimides and high strength carbon fibers may be improved by sizing the carbon fibers with uncapped or capped linear polyamideimides. The uncapped linear polyamideimides useful as carbon fiber sizings generally contain repeating units having the general formula: ##STR1## Wherein R.sub.2 =a trivalent organic radical and generally benzenetriyl;

Composites containing amideimide sized fibers

Sizing for carbon fibers with uncapped or capped linear polyamideimides. The uncapped linear polyamideimides useful as carbon fiber sizings generally contain repeating units having the general formula: ##STR1## Wherein R.sub.2 =a trivalent organic radical and generally benzenetriyl;

Amideimide sizing for carbon fiber

The thermooxidative stability and thermomechanical properties of advanced composites which use high performance resin matrices such as polyimides and high strength carbon fibers may be improved by sizing the carbon fibers with uncapped or capped linear polyamideimides. The uncapped linear polyamideimides useful as carbon fiber sizings generally contain repeating units having the general formula: ##STR1## wherein R.sub.2 =a trivalent organic radical and generally benzenetriyl;

Crosslinkable polyamideimide oligomers and a method of preparation

High thermal stabilities are achievable in linear or multidimensional sulfone, solvent resistant oligomers by incorporating oxazole, thiazole, or imidazole linkages into the oligomer backbone. Blended oligomers of crosslinking oligomers and noncrosslinking compatible polymers are also described. The oligomers include residues of four-functional compounds of the formula: ##STR1## (or isomers thereof) wherein M=--CO--, --S--, --O--, --SO.sub.2 -- or --(CF.sub.3).sub.2 C--; and

Heterocycle oligomer blends

High thermal stabilities are achievable in linear or multidimensional sulfone, solvent resistant oligomers by incorporating oxazole, thiazole, or imidazole linkages into the oligomer backbone. Blended oligomers of crosslinking oligomers and noncrosslinking compatible polymers are also described. The oligomers include residues of four-functional compounds of the formula: ##STR1## wherein M=--CO--, --S--, --O--, --SO.sub.2 -- or --(CF.sub.3).sub.2 C--; and

Growing community of inventors

Kirkland, WA, United States of America

Ronald R Stephenson