Ever wish your automobile was a different color, but didn't want to go to the expense and time of painting it? Then obtain a body like the one covered by U.S. Patent No. 2,596,566 issued to H. L. Lacy et al on March 13, 1952. This novel invention is for a "Changeable Color Automobile Body."

This body is made of two skins of transparent or translucent material with narrow spacings between them into which the color medium is pumped. The desired color medium is pumped between the two skins until it fills up all space between them. When the owner wishes to change the color of the body, a valve is opened, the coloring liquid drained off, the body flushed out and the new coloring liquid pumped in.

Although this patent calls for and shows the invention applied only to the roof of the automobile, there is nothing to say it cannot be adapted to the entire body of the car.

The invention obviously involves a number of liquid containing tanks, tubing, electric pumps and control switches. So far as is known, it has yet to go into mass production.

A lady by the name of Jane Grant recently invented a much-needed safety device for telephone credit card users. Her invention, one of five she has in the works, is a simple but revolutionary advice that permits a telephone caller to give the phone operator their credit card number without divulging it to anyone within sight or earshot.

The front or face of the telephone where the dial or touch-tone buttons are located has been completely restructed by Grant to accomodate a slot in which a specially designed credit card may be placed by the user. The pressing of a series of numbered buttons indicates to the phone company who the caller is and what his or her credit card number is.

The safety device can be adapted to home, business or pay telephones in a minimum of time by any telephone installer at very little additional cost. If adapted to pay telephones, the face of the telephone can be modified to receive dollar bills and make change for the caller. Grant predicts that within a few years all telephones will be equipped with her invention.

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

Anthony J. Antonious of Townson. Adjustable Instep Gore Assembly. Patent No. 4,215,493. 17 claims.

Norman W. Bartlett of Joppa. Photographic Shadowless Reflector. Design Patent No. D256,249. Term of 14 years.

Joshua D. Elrich of Silver Spring. Water Pipe. Patent No. 4,215,707. 8 claims.

Donald C. Erickson of Annapolis. Hydrogen Production From Carbonaceous Fuels Using Intermediate Oxidation-Reduction. Patent No. 4,216,199. 15 claims.

Paul D. Frazier of Rockville. Orthodontic Headgear Appliance Safety System. Patent No. 4,215,983. 9 claims.

John E. Garriss of Baltimore. Energy Conserving Laboratory Hood System. Patent No. 4,215,627. 3 claims.

Richard N. Johnson of Adelphi. Digital Beam Former. Patent No. 4,216,475. 15 claims.

Rudolph Kodras of Baltimore. Process for Liquid-Liquid Sorbent Extraction. Patent No. 4,215,994. 4 claims.

Kurt G. F. Moeller of Annapolis. Shock Cruch Sub-Foundation. Patent No. 4,215,645. 11 claims.

Salvatore Reale of Preston. Cooking Grate. Patent No. 4,215,670. 6 claims.

Lorin R. Stieff of Kensington. Field Method for Detecting Deposits Containing Uranium and Thorium. Patent No. 4,216,380. 4 claims.

Jerome B. Thompson of Cumberland. Method of Baking and English Muffin and Product Thereof. Patent No. 4,216,241. 3 claims.

Russell K. Winter of Crownsville, Nedium Savas of Bethesda, Joseph H. Snively of Catonsville, and Thomas D. Harvey of Chevy Chase. jClutch Bag Display Unit. Design Patent No. D256,198. Term of 14 years.

Filbert J. Bartoli of Upper Marlboro, et al. Method for Determining the Compensation Density in N-Type Narrow-Gap Semiconductors. Patent No. 4,217,547. 5 claims.

Curtis P. Mabie of Thurmont and Daniel L. Menis of Gaithersburg. Microporous Glassy Fillers for Dental Resin Composits. Patent No. 4,217,264. 15 claims.

Daniel D. Musgrave of Cabin John. Magazine Status Indicating Process. Patent No. 4,216,601. 10 claims.

Matthew O'Boyle of Cockeysville, et al. Lithium Halide Battery. Patent No. 4,217,403. 6 claims.

Christopher R. Vale of Elkridge. Surface Wave Phase Correlator and Monopulse Radar System Employing the Same Patent No. 4,217,563. 1 claim. VIRGINIA

Stephen M. Bolick of Alexandria and John O. Vought of Burke. Pressure Regulatory Assembly Guard. Patent No. 4,215,581. 9 claims.

Samuel T. Collins of Bassett. Armchair Design Patent No. D256,193. Term of 14 years.

Theodore Dowd of Arlington. Method of Detoxifying Organotin-Containing Paint Residues. Patent No. 4,216,187. 1 claim.

John M. Embree of Charlottesville. Solar Heating Collector Assembly. Patent No. 4,215, 675. 16 claims.

William G. Fodor of Blairs. Rake. Patent No. 4,215,528. 2 claims.

Alexander P. Janssen of Charlottesville. Cooking Utensils. Patent No. 4,215,629. 6 claims.

Roger E. Riggs and Michael D. Shell of Reston. Radiant Electromagnetic Energy Collector. Patent No. 4,215,674. 15 claims.

Roland H. Shubert of Reston. Magnetic Separation of Particulate Mixtures. Reissued Patent No. Re. 30,360. 29 claims.

Oise R. Allen of Richmond. Apparatus for Safeguarding Money. Patent No. 4,216,901. 2 claims.

William M. Chisholm of Midlothian. Methods of and Apparatus for Assembling Articles with a Support. Patent No. 4,216,580. 26 claims.

Emmett M. Cunningham of Alexandria. Portable Turntable for Microwave Oven. Patent No. 4,216,727. 10 claims.

Felix S. Jabsen of Lynchburg. Nuclear Reactor Inspection Device. Patent No. 4,217, 173. 2 claims.

Charles K. Kao of Roanoke. Interlocking Precision Optical Fiber Connector or Support. Patent No. 4,217,029. 12 claims.

Grant V. Mack of Richmond. Support Member and Method of Manufacture. Patent No. 4,216,632. 12 claims.

Harry E. Walmer and Judd Horbaly of Alexandria. Doll House. Patent No. 4,216,608. 10 claims. DISTRICT OF COLUMBIA

Elizabeth B. Miles, Fare Card Case. Design Patent No. D256,187. Term of 14 years.

Tad Stanwick. Method of Generating Rotary Power in a Deep Sea Environment. Patent No. 4,215,544. 9 claims.

Arthur B. Niles. Weight Lifter Safety Chain. Patent No. 4,216,969. 1 claim.

Claim: Defines the invention and sets forth the bounds of the property rights granted the inventor.

Copies of any of the above patents can be obtained from the Patent & Trade Mark Office for 50 cents each by addressing orders to the Commissioner of Patents and Trademarks, Washington, D.C. 20231.