Copper Development Association, Inc.

Amalgamated Technologies, Inc.

Roy E Beal

Scott A McCracken

A coolant recycling apparatus has a boiler and condenser for distilling a glycol and water from a used coolant. The glycol and water are recombined in a mixing tank to form a mixture having a desired ratio of water to glycol, and an inhibitor is added to the mixture to obtain a fresh coolant mixture ready for use in an engine cooling system. Contaminants in the used coolant are concentrated to form a sludge.

Coolant recycling method and apparatus

A method of joining metal surfaces is provided which comprises contacting the metal surfaces with a zinc-based composition and joining the metal surfaces, the zinc-based composition comprising, by weight:

Soldering compositions, fluxes and methods of use

A zinc-based composition comprising, by weight:

A zinc-based composition comprising from 0.01 to 5 percent lead and 0.01 to 20 percent tin, preferably minor amounts of chromium and/or titanium and/or nickel and with the balance being zinc is provided. A minor amount of copper may also be present. The composition is particularly useful for joining copper and copper alloys because it will wet and readily flow on the copper or copper alloy surfaces. It can be used with or without a flux. It has reduced dissolving action on the copper and copper alloys due to its reduced reactivity with them. It also has improved conductivity vis-a-vis conventional lead-tin and lead-tin-silver solders.

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Scottsdale, AZ, United States of America

Roy E Beal