Patents granted in May to residents of Maryland, the District and Virginia. MARYLAND

Carlo Faustini of Silver Spring. Fireplace heat exchanger apparatus and method. No. 4,381,759. 18 Claims.

Philip A. Studer of Silver Spring. Magnetic bearing and motor. No. 4,381,875. 20 Claims.

Mark E. Ackman of Cockeysville, pseudo-synchronized data communication system. No. 4,382,287. 5 Claims.

Bruce P. Burns of Churchville, longitudinal reinforcement of high explosive fill in projectiles. No. 4,382,409. 3 Claims.

Ogden Kellogg-Smith of Ornold, detachable nestable mast steps. No. 4,382,416. 8 Claims.

Anthony R. Calisto of Takoma Park, interchangeable nozzle apparatus. No. 4,382,530. 6 Claims.

Terrence P. McGovern of Bowie, insect repellants. No. 4,382,950. 1 Claim.

Dennis C. Nagle of Catonsville, magnesia refractories bonded with sulfamic acid. No. 4,383,045. 14 Claims.

Mark W. Goldberg of Laurel, method for laser recording utilizing dynamic preheating. No. 4,383,261. 4 Claims.

LeRoy Stansbury Jr., and William F. Dovoan, both of Aberdeen, primer device. No. 4,383,472. 3 Claims.

Arthur D. Coates of Hartford City, ballistic projectile. No. 4,383,485. 4 Claims.

Edward G. Bounds of Salisbury, foundation-based solar heating system. No. 4,383,521. 9 Claims.

Robert H. Proctor of Cockeysville, grommet seal. No. 4,383,692. 5 Claims.

Stephen H. Rice of Waldorf. Method for milling and drilling glass. No. 4,383,785. 7 Claims.

Joseph P. Rutherford of Jerrettsville, foliar growth promoting mixture. No. 4,383,845. 17 Claims.

Carl A. Zapffe of Baltimore, corrosion-resistant fe-cr-uranium pellet and method for making the same. No. 4,383,853. 15 Claims.

John H. Boucher of Silver Spring, method of treating horses to inhibit or reduce increases in crenated red blood cells during exercise. No. 4,383,997. 9 Claims.

James L. Guthrie of Ashton, flexible polyurethane foam based on mdi. No. 4,384,051. 15 Claims.

Herman H. Lowell of Silver Spring. Electric heating element. No. 4,384,192. 13 Claims.

Robert E. Brown of Silver Spring. Oscillator/driver circuit for fluxgatemagnetometer. No. 4,384,254. 5 Claims.

Bernard L. Lewis of Oxon Hill, and Frank F. Kretschmer, Jr., of Laurel. Efficient low sidelobe pulse compression. No. 4,384,291. 7 Claims.

Paul T. Kurmilk of Gaithersburg. Facsimile communications interface adapter. No. 4,384,307. 21 Claims.

Walter S. Rosenbaum of Bethesda, and Alan R. Tannenbaum of Washington Grove, retrieval of related linguistic expressions including synonyms and antonyms. No. 4,384,329. 7 Claims.

Kenneth L. Moore of Silver Spring. Duplex round. No. 4,384,528. 10 Claims.

Bruce P. Burns of Churchville, and William F. Donovan of Aberdeen. Projectile seal. No. 4,384,529. 11 Claims.

Thomas W. Winstead of Baltimore. Apparatus for the continuous formation of biaxially orientated thermoplastic materials and forming articles therefrom by intermittent forming means interfaced therewith. No. 4,384,836. 21 Claims.

Daniel L. Klayman of Chevy Chase. 2-acetyl-and 2-propionylpyridine thiosemicarbazones as antimalarials. No. 4,385,055. 12 Claims.

Daniel E. Hubis of Elkton. Multi-component, highly porous, high strength particle and method for manufacturing same. No. 4,385,093. 22 Claims.

Emmett W. Chappelle of Baltimore. Rapid, quantitative determination of bacteria in water. No. 4,385,113. 45 Claims.

Ronald N. Fracalossi; Walter V. V. Greenhouse, and Michael S. Buchanan, all of Baltimore. Polyurethane foam resistant to smoldering combustion containing either urea or melamine. No. 4,385,131. 13 Claims. MARYLAND DESIGN PATENTS:*

* For a term of 14 years.

Franklin G. Mack of Baltimore. Playing die. No. D 268,851.

Wayne B. Stone Jr., of Bethesda. Beverage decanter. No. D 268,887.

Harry C. Winter of Chestertown. Tire valve. No. D 268,924.

Robert Berinson of Silver Spring. Piano-shaped bulletin board. No. D 268,936. VIRGINIA

Kalidas Chakravarti of Richmond, and Stanley D. Lazarus of Petersburg. Process for the production of reinforced rubber articles. No. 4,381,640. 11 Claims.

Merle S. Kahn of Richmond. Membrane closure structure. No. 4,381,848. 10 Claims.

John H. Olson of Newport News. Laminated gob for pressing glass articles. No. 4,381,932. 8 Claims.

Irwin A. Braude of Burke. Purification of human immune interferon. No. 4,382,027. 17 Claims.

Michael W. Evans of Lynchburg. Binary digit or bit restoration circuit. No. 4,382,298. 5 Claims.

Rolf Brand of South Hill. Lightweight aircraft. No. 4,382,566. 13 Claims.

David J. Horen of Virginia Beach. Scaffold bracket and hanger therefore. No. 4,382,571. 10 Claims.

Barbara D. Tolar of Hampton. Swing seat adapter. No. 4,382,595. 12 Claims.

Henry A. Thompson of Manassas. Measuring of feature for photo interpretation. No. 4,382,678. 10 Claims.

Don M. Coates of Midlothian. Coating composition for fibrous polyolefin sheets. No. 4,382,990. 10 Claims.

Charles W. Harris of Chesterfield, and Charles A. Gregory of Richmond. Microcoputer device having simultatious input and output functions. No. 4,383, 302. 1 Claim.

Alfred Hinzmann of Weams. Method and apparatus for monitoring the locations of perforations in webs of wrapping material for filter cigarettes or the like. No. 4,383,435. 17 Claims.

Peter Durenec of Annandale, and Aubrey J. Dunn of Springfield. Evacuating-charging valve assembly. No. 4,383,548. 1 Claim.

James S. Shreve of Fairfax. Electrically controlled damper. No. 4,383,641. 8 Claims.

John P. Felburn of Arlington. Steerable trailer. No. 4,383,698. 19 Claims.

Charles E. Bogese, and Stephen B. Gogese, II, both of Roanoke. Cable assembly having shielded conductor. No. 4,383,725. 19 Claims.

Charles J. O'Connell of Warrenton. Remote camera actuator. No. 4,383,744. 1 Claim.

Richard S. Muller of Richmond, and Richard C. Dickerson of Virginia Beach. Mobile fluid purification system. No. 4,383,920. 18 Claims.

Donald Caswell, and David J. Stout, both of Waynesboro. Secondary carpet backing fabric. No. 4,384,018. 8 Claims.

John M. Terpay of Danville. Pressure-sensitive flocked fastener and method of making same. No. Re. 31,252. 20 Claims.

William L. Bohlayer of Middleburg. Columnar sundial. No. 4,384,408. 19 Claims.

Rodney I. Smith of Midland. Prefabricated fireplace. No. 4,384,566. 9 Claims.

Lawtence E. Anderson of Alexandria. Defensive target apparatus. No. 4,384,723. 19 Claims.

Alexander P. Jannssen of Charlottesville. Visible indexes. No. 4,384,912. 7 Claims.

Glenn E. Stoner; Louie L. Scribner, Jr., and George L. Cahen, Jr., all of Charlottesville. Fluid treatment. No. 4,384,943. 10 Claims. DISTRICT

Philip Retz. Vortex turbine apparatus. No. 4,382,746. 40 Claims.

Michael S. Wysor. Silver metachloridine. No. 4,384,117. 1 Claim.