Atmospheric Environment Vol. 25A, No. 11, pp. i-ii, 1991 Pergamon Press plc. Printed in Great Britain

NEW PATENTS

This Section contains abstracts and, where appropriate, illustrations of recently issued United States patents and published patent applications filed from over 30 countries under the Patent Cooperation Treaty. This information was obtained from recent additions to the Pergamon PATSEARCH ® online database in accordance with interest profiles developed by the Editors. Further information about Pergamon PATSEARCH ® can be obtained from Pergamon Orbit InfoLine Inc., 8000 Westpark Drive, McLean, Virginia 22102, U.S.A.

Copies of complete patents announced in this Section are available from Pergamon Orbit InfoLine Inc. for $8 per copy. Payment with order is required. Orders outside North America add $2 for air postage. Order by patent number for Pergamon Orbit InfoLine only.

4966920

S M O K E A N D T O X I C G A S S U P P R E S S A N T C O M P O S I T I O N

James Gainer, Robert Bentley, Worsley, United Kingdom assigned to Ciba-Geigy Corporation

The present invention provides a composition comprising a combustible material containing urethane linkages; and as a smoke and toxic gas suppressant, a polyester which has an acid value below 30 mg KOH/g, preferably below 10 mg KOH/g, and which is derived from: Ia.(A) a component which contains 4 carboxyl groups or anhydride thereof, and which is preferably an aromatic component, or Ib. a mixture of (A) and (B): (B) one or more components which contain 2 to 12, preferably 2 to 4, carboxyl groups or 1 to 6, preferably 1 or 2, carboxylic anhydride groups, selected from: (B1) an aliphatic carbox- ylic acid compnent containing 2-16 carbon atoms; ((B2) a cyclic non-aromatic carboxylic acid containing 7-17 carbon atoms; and (B3) an aromatic carboxylic acid containing 8-16 carbon atoms; and II.(C) at least one aliphatic, cyclo- aliphatic or aromatic polyhydroxyl component containing 2 to 8 hydroxyl groups, and the amount of polyester is from to 50 100% based on the weight of polyol used to make the com- bustible material.

4968488

I N T E G R A T E D S Y S T E M F O R P O L L U T I O N A B A T E M E N T A N D

E N E R G Y D E R I V A T I O N F R O M S T E A M

Jerome S Spevack

An integrated system for the derivation of useful energy from impure steam and/or use in connec- tion therewith, said steam containing both hydrogen sulfide and an alkaline acting compo- nent, such as ammonia, while producing liquid- phase and gaseous-phase effluents from condensation of the impure steam and substan- tially reducing the emission of sulfur-containing compounds to the environment. Treatment of such effluents to selectively react or bind alkaline acting components in the liquid-phase results in an augmented concentration of hydrogen sulfide in the gaseous-phase and its depletion in the liquid-phase. The gaseous-phase comprising noncondensable gas contaminants and uncon- densed water vapor is separated from the liquid- phase steam condensate and treated to remove hydrogen sulfide to produce an environmentally acceptable vent gas which may be discharged to the atmosphere.

4970971

S Y S T E M O F A N D A P P A R A T U S F O R S A N I T I Z I N G W A S T E

M A T E R I A L

Robert M Williams

A method for disposing by incineration of oil contaminated waste material after removal of solids of various kinds by performing multiple steps in its handlingwherein the composite material is first subjected to a first classification step for extracting a high percentage of con- taminant free material. After subjecting the material to a second classification cyclone where the gases that are used to transport the ground matter can be separated while the solids are sub-