1
Philip S Kirk, John J Dugan: Method and apparatus for reducing airplane noise. Dugan Air Technologies, Nixon & Vanderhye P C, December 19, 2000: US06161797 (33 worldwide citation)

A modification of a 727 airplane, including a change in wing profile, to affect flight characteristics and the engines to lessen noise, such that the takeoff and landing procedure is modified so that engine power may be reduced, permitting the modified aircraft to meet the latest noise requirements ...


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Peter G Miasek, John J Dugan: Regeneration of alkali metal sulfides from alkali metal hydrosulfides. Imperial Oil Enterprises, Marthe L Gibbons, April 3, 1979: US04147612 (14 worldwide citation)

Alkali metal sulfides are regenerated from alkali metal hydrosulfides which are produced as a result of the hydroconversion of heavy carbonaceous feeds. The regeneration is effected by contacting the alkali metal hydrosulfide with a metal oxide at elevated temperatures.


3
Peter G Miasek, John J Dugan: Regeneration of alkali metal sulfides from alkali metal hydrosulfides. Imperial Oil Enterprises, Marthe L Gibbons, April 3, 1979: US04147611 (13 worldwide citation)

Alkali metal sulfides are regenerated from alkali metal hydrosulfides which are produced as a result of the hydroconversion of heavy carbonaceous feeds. The regeneration is effected by treating the spent solids from a hydroconversion reactor, said solids containing an alkali metal hydrosulfide, with ...


4
John J Dugan, Jackson Eng: Deasphalting with liquid hydrogen sulfide. Exxon Research and Engineering Company, Edward M Corcoran, October 18, 1977: US04054512 (6 worldwide citation)

An asphalt-containing mineral oil is deasphalted by contacting the oil with a liquid hydrogen sulfide deasphalting solvent for a time sufficient to remove a substantial portion of the asphalt from the oil. Utilization of liquid hydrogen sulfide as the deasphalting solvent is capable of giving high y ...


5
Michael B Davis, John J Dugan, James D Eagan, Adrianus Welmers: Recovering a relatively volatile component of a solution from a less volatile component, e.g. as in solvent recovery. Exxon Research and Engineering Company, Joseph J Allocca, James H Takemoto, May 27, 1997: US05632867 (5 worldwide citation)

In a solvent recovery plant including a recovery or distillation tower from which solvent product is recovered overhead, an isothermal separator, preferably a cyclone, is used to separate liquid phase contaminant (i.e. oil in a lubricating oil extraction process) in overhead product and to feed the ...


6
John J Dugan: Apparatus for reducing noise in the jet engine. Jensen & Puntigam PS, August 6, 2002: US06427801 (2 worldwide citation)

A apparatus and method for augmenting the thrust of a jet engine while reducing the noise generated thereby, including extending the thrust reverser sleeve, exposing the cascades while retaining the thrust reverser doors or buckets in their stowed position.


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John J Dugan: Apparatus and method for reducing jet engine noise. Robert A Jensen, Jensen & Puntigam Ps, July 18, 2002: US20020092948-A1

A means for augmenting the thrust of a jet engine while reducing the noise generated thereby, including extending the thrust reverser sleeve or sleeve halves, thereby exposing the cascades to admit ambient air while retaining the thrust reverser blocker doors or buckets in their stowed position, or ...


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