Now showing items 31-40 of 163
Active control of aircraft engine inlet noise using compact sound sources and distributed error sensors
(United States Patent and Trademark Office, 1994-10-11)
An active noise control system using a compact sound source is effective to reduce aircraft engine duct noise. The fan noise from a turbofan engine is controlled using an adaptive filtered-x LMS algorithm. Single multi ...
Water soluble derivatives of taxol
(United States Patent and Trademark Office, 1994-10-04)
Sulfonated 2'-acryloyltaxol and sulfonated 2'-O-acyl acid taxol derivatives are synthesized which have improved water solubility and stability while maintaining bio-activity. In particular, 2'-[(3-sulfo-1-oxopropyl)oxy]taxol ...
Carbonate polymers containing ethenyl aryl moieties
(United States Patent and Trademark Office, 1994-11-08)
There are disclosed carbonate polymers having ethenyl aryl moieties. Such carbonate polymers are prepared from one or more multi-hydric compounds and have an average degree of polymerization of at least about 1 based on ...
Fine powders of ketone-containing aromatic polymers and process of manufacture
(United States Patent and Trademark Office, 1994-10-18)
Fine particles of semi-crystalline ketone-containing aromatic polymers (PEEK, PEKK, etc.) are produced by controlling the rate and conditions of hydrolysis of an amorphous polyarylketimine intermediate. The choice of acid ...
Fused biconical taper fiber optic coupler station and fabrication techniques
(United States Patent and Trademark Office, 1994-08-16)
The fibers are bound together about 1 cm apart. An oxy-propane torch is used to heat the fibers so that they fuse together. At the same time, the two relatively movable translational stages to which the fibers are clamped ...
Fully alkoxysilane-functionalized aliphatic polyamine compounds
(United States Patent and Trademark Office, 1994-12-06)
Fully alkoxysilane-functionalized aliphatic polyamine compounds (e.g., fully functionalized dialkylenetriamine compounds) can be formed by reacting a dialkylenetriamine (e.g., diethylenetriamine) with a compound comprising ...
Method of reducing flow metastability in an ejector nozzle
(United States Patent and Trademark Office, 1994-09-06)
A method of reducing flow metastability in a liquid refrigerant in an ejector nozzle by generating dispersed bubbles in the flow entering the nozzle by first forming relatively large bubbles and then breaking them down ...
Bis(reissert compounds) from reaction of monoaldehyde, monoamine and diacid halide
(United States Patent and Trademark Office, 1992-07-14)
A bis Reissert can be formed by the initial reaction of an aliphatic or aromatic aldehyde (e.g., propionaldehyde) and primary amine (e.g., methylamine) to form a reaction product which is then reacted with a diacid chloride ...
High temperature electrode-barriers for ferroelectric and other capacitor structures
(United States Patent and Trademark Office, 1998-08-04)
A capacitor for use on silicon or other substrate has a multilayer electrode structure. In a preferred embodiment, a bottom electrode situated on the substrate has a bottom layer of Pt--Rh--O.sub.x, an intermediate layer ...
Non-toxic liquid metal composition for use as a mercury substitute
(United States Patent and Trademark Office, 1998-08-11)
Liquid gallium or gallium alloy is utilized as a mercury substitute for a variety of applications. The liquid gallium or gallium alloy is either free of metal oxides or has only very low quantities of metal oxides.