Now showing items 161-165 of 165
Stub loaded helix antenna
(United States Patent and Trademark Office, 1999-11-16)
A helical antenna having stubs spaced along the helix curve length and extending toward the central axis of the helix, such that the performance characteristics of the antenna, such as gain and circular polarization, are ...
Supported aqueous phase organometallic catalyst useful for hydroformylation and other reactions, and a method for its preparation
(United States Patent and Trademark Office, 1991-02-19)
This invention relates to a catalyst comprising a solid surface having immobilized thereon an aqueous solution of one or more organic complexes of rhodium. The catalyst is useful for promoting hydroformylation, hydrogenation ...
Ceramic materials with low thermal conductivity and low coefficients of thermal expansion
(United States Patent and Trademark Office, 1992-04-07)
Compositions having the general formula (Ca.sub.x Mg.sub.1-x)Zr.sub.4 (PO.sub.4).sub.6 where x is between 0.5 and 0.99 are produced by solid state and sol-gel processes. In a preferred embodiment, when x is between 0.5 and ...
Polyalkylvinyl ether/polyalkyloxazoline copolymers, processes for making, and uses
(United States Patent and Trademark Office, 1992-03-24)
Graft and block copolymers of polyalkylvinyl ether and polyoxazoline moieties can be used as polymeric compatibilizers.
Synthesis of alpha-aminonitriles
(United States Patent and Trademark Office, 1992-12-08)
Alpha-aminonitriles can be synthesized by the reaction, at ambient temperature without use of catalyst, of essentially stoichiometric amounts of amine, aldehyde (either monoaldehyde or dialdehyde) and trimethylsilyl cyanide.