Cryo-Temper (Durable Metal Products Company)  
   DMP manufactures industrial cryogenic tempering systems for both high-temperature and low-temperature use.
   http://www.cryo-temper.com/

Cryotron (Canada) Ltd.  
   Cryogenic processing of equipment. Has a nicely detailed overview of the company's Vari-Cold cryogenic process and equipment. In Spruce Grove, Alberta, Canada.
   http://www.cryotron.com

American Cryogenics, Inc.  
   Microprocessor controlled deep cryoheat treatment of tool and high speed steels. Custom cryoprocessor design and fabrication. In Waukesha, WI
   http://www.americancryogenics.com/

The Brass Bow  
   Specialists in the cryogenic freezing of musical instruments. Very good explanation of the process. In Arlington Heights, Illinois.
   http://www.thebrassbow.com/brassbw1.htm

CryoPlus Inc.  
   Cryogenic treatment of all metal tooling, stamping dies, gun barrels, engine components, brass instruments. To make them more wear resistant. In Wooster, Ohio.
   http://www.cryoplus.com/

One Cryo  
   Cryogenic tempering treatment services for auto racing, tooling, firearms, golf clubs and musical instruments - Seattle, Washington and Wasilla, Alaska
   http://www.onecryo.com/

Diversified Cryogenics  
   Cryogenic Processing improves the life of your guns, engines, instruments, and tools. Located in Minneapolis, Minnesota, United States.
   http://www.diversifiedcryogenics.com/

Cryopro Temper-Master  
   Temper-Master cryogenic processor manufacturing and tempering. Improves durability and performance of tools, musical instruments, and gun barrels. In Springfield, MO.
   http://www.cryopro.com/

Advisor In Metals  
   Home of William "Bill" Bryson, metallurgist who specializes in the theory and practice of cryogenic and heat treatment of materials. Author of a technical book on each subject. Also provides cryogenic processing services and sales of cryogenic
   http://www.worldpath.net/~hisaim/

Cryogenic Engineering  
   Specializes in deep cryogenic tempering, extending the useful life of tools, metal parts, plastics and other materials. In Cedar Rapids, IA.
   http://www.cryoeng.com/

Fountainhead Cryogenic Processing  
   Deep cryogenic processing and tempering of all your tooling and wear parts. In York PA.
   http://www.fountainheadcryo.com

TechSpec, Inc. Cryogenic Treatment Center  
   TechSpec Inc. is a Deep Cryogenic Treatment Center, which improves the performance of musical instruments, tools, dies, guns, golf clubs, bearings, engines, hammermills, and rotors. In Kansas City MO.
   http://www.cryometals.com

Controlled Thermal Processing Cryogenics  
   Cryogenic processing for racing and many industrial applications, including tools and firearms. In Chicago and Rockford, IL, Charlotte, NC, and Waltharn, MA.
   http://www.metal-wear.com

Cold Fire  
   Custom-built cryogenic systems and treatment of items to increase strength and durability. In Largo, FL.
   http://www.coldfire.com/

300 Below, Inc.  
   Cryogenic treatment (deep tempering) for motor sports, firearms, softball bats, golf clubs, and musical instruments. In Decatur, IL.
   http://www.300below.com/

ThermoDyne  
   Cryogenics and integrated thermal coatings for engine parts, industrial tools, and sporting equipment. In White City, Oregon.
   http://www.nicindustries.com/NewFiles/thermo_home.html

Cryocon, Inc.  
   Deep Cryogenic Tempering (DCT) of metals, alloys, and other synthetic materials. The only publicly traded Cryogenics company (OTC BB:CRYQ). In Ogden, Utah.
   http://www.cryocon.org/

Cryoforce, L.C.  
   A manufacturer and distributor of cryogenic processing equipment, which licenses its techniques to companies in several states. In Lenexa, KS.
   http://www.cryoforce.com/

Frozen Solid  
   Deep Cryogenic Processing of most ferrous and non-ferrous materials to increase durability and wear resistance. Located in Suffolk, England
   http://www.frozensolid.co.uk

Alpine Cryogenics, Inc.  
   Cryogenic processing of materials, including tools, auto parts, and rifle barrels. One page has a useful research article with photographs. In Moscow, PA.
   http://alpinecryo.com/

Basics of Cryonics Metallurgy  
   Good basic article on how cryogenic processing works. Author unknown. Date, circa 1998.
   http://lennon.pub.csufresno.edu/%7Erlk16/cryo.html

Role of Eta-carbide Precipitations in the Wear Resistance Improvements of  
   1994 technical article (from the journal ISIJ International) which investigates the wear resistance and the microstructure of tempered alloy tool steels after cryogenic treatment.
   http://www.cryogenius.co.za/Cryo_Tech_Article1.html

Dynatherm Alloys -- Deep Cryogenics  
   Cryogenic treatment of metals, especially engine parts. In South India.
   http://www.dynat.com/dyna-deep-cyro.html

Cryo-Tech Ltd.  
   Sale of cryogenic processors to Asia and Pacific areas. Also provides cryoprocessing services at several sites throughout New Zealand.
   http://www.cryogenic.co.nz

Carboteh Engineering: Cryo Cool  
   Cryogenic tempering of brake rotors for automotive road racing and manufacturer of racing brake pads. In Ft. Lauderdale, Florida.
   http://www.carbotecheng.com/prod-ct-cryocool.htm

Cryotreatment: Panacea or Black Magic?  
   A detailed discussion of the pros and cons of cryogenic treatment, from Cold Facts, the quarterly magazine of the Cryogenic Society of America, Spring 1996.
   http://www.cryogenicsociety.org/csa_bin/back_issues/spring96/spring96_1.html

Leading Edge Cryogenics, Inc.  
   Leading Edge Cryogenics has pioneered cryogenic process engineering, with three patents on the process used to treat spark plugs, brake pads, and orthopedic devices. In Camp Verde, Arizona.
   http://www.lecryo.com

Cryogenic Institute of New England, Inc.  
   Provider of Nitrofreeze Cryogenic Tempering services for industrial, commercial and recreational applications. Site includes Application Notes and Technical Articles on cryogenic tempering. In Worcester, MA. Site not currently viewable with some version
   http://nitrofreeze.com

Cryogenics of Indiana  
   Thermo tempering of metals for maximum performance, durability, and life. In Zionsville, IN.
   http://www.cryogenicsofindiana.com

Integrated Cryogenic Systems Inc.  
   A cryogenic tempering treatment company that increases the life of tools, equipment, parts and materials. In Calgary, Alberta, Canada.
   http://www.cryointegrity.com

Cryogenics International Cryogenic Systems and Processing  
   Cryogenics International manufactures deep cryogenic treatment systems and provides cryogenic processing for automotive racing engines, tools, musical instruments, etc. In Scottsdale, AZ
   http://www.cryogenicsinternational.com

NW Cryogenics Cold-treatment Services  
   Cryogenic processing of metals, composites, electronics and some polymers. In Newberg, OR.
   http://www.nwcryo.com

Metal Science Services  
   Computer-controlled cryogenic processing and heat treating services that enhance steel performance for tooling, motor sports, knives, and firearms. Site also explains the science supporting cryogenic processing. In Driftwood TX.
   http://www.metalscience.com/

Cryo-Dyne, Inc.  
   A company that specialzes in cryogenic metal processing. In Mobile, Alabama.
   http://www.cryodyne.com

Future Technology Services Inc.  
   Cryogenic processing of tools, sports equipment, etc. at -120 and -300 Deg. Also offers service in thin film industrial coatings. In Lapeer, Michigan.
   http://www.fts4u.com

York Cryogenics  
   Deep cryogenic processing of heat-treated steel, carbide, machine parts, auto parts, firearms, musical instruments, and some plastics. In York, PA.
   http://www.yorkcryogenics.com