Raymond W Davis

US Patent:

40494730, Sep 20, 1977

Filed:

Mar 11, 1976

Appl. No.:

5/665844

Inventors:

Raymond L. Davis - Newtown Square PA
Robert I. Beck - Somerset NJ

Assignee:

Airco, Inc. - Montvale NJ

International Classification:

C21D 148

US Classification:

148 165

Abstract:

The present invention relates to a method of carburizing and carbonitriding steel parts in the work chamber of a vestibule furnace with a substantially reduced consumption of carbon sources by exposing such parts to a gaseous carbon source such as natural gas while supplying an inert gas to the vestibule at a sufficient rate to control the entry of atmospheric decarburizing agents into the work chamber and to maintain the oxygen content in the vestibule at safe levels, below a minimum level required for supporting combustion or for allowing local puffs and explosions. The vestibule furnace may be of the batch or continuous type. In addition, the carbon potential of the atmosphere within the work chamber of the furnace is preferably continuously sensed and in response to such sensed carbon potential, the flow of natural gas to the work chamber is controlled so as to maintain the carbon potential at a predetermined value.

US Patent:

40282414, Jun 7, 1977

Filed:

Oct 1, 1976

Appl. No.:

5/728773

Inventors:

Raymond R. Davis - Pitman NJ
Alfred M. Langberg - Sewell NJ
Alvin P. Debus - Pitman NJ

Assignee:

Hungerford & Terry, Inc. - Clayton NJ

International Classification:

B01D 4102

US Classification:

210 60

Abstract:

A system for recovering chemically-treated water used to backwash and rinse a manganese oxide zeolite filter. The backwash and rinse waters are placed in a recovery basin, preferably with a coagulating agent, wherein the waters are agitated and then allowed to settle and thereby to separate from the water impurities removed from the filter. The backwash and rinse water so purified is then returned to the filter inlet for a normal service filtering pass through the filter. A number of filters are preferably serviced by each recovery basin, and automatic control means for the system are also disclosed.