Ipsen – U.S. Granted Patents

Since the time Ipsen was founded by Harold Ipsen in 1948, we have remained committed to innovation and finding new ways to improve heat-treating systems, ancillary equipment and modes of operation. With nearly 100 patents granted in the United States, as well as numerous patents granted in countries around the world, the many advances and contributions Ipsen has made to the industry over the decades is clear. Below is a full list of Ipsen's U.S. granted patents over the years, as well as those that were the work of Harold Ipsen himself.

2010 to Present

  • Load transport mechanism for a multi-station heat treating system – No. US9719149B2: Issued August 1, 2017.
  • Quenching process and apparatus for practicing said process – No. US9617611B2: Issued April 11, 2017.
  • Process for cooling a metal workload in a multimedia quench system – No. US9458519B2: Issued October 4, 2016.
  • Work load lifting system for a vertical vacuum furnace – No. US9441886B2: Issued September 13, 2016.
  • Method and industrial furnace for using a residual protective gas as a heating gas – No. US9188392B2: November 17, 2015.
  • Sealing mechanism for a vacuum heat treating furnace – No. US8992213B2: Issued March 31, 2015.
  • Device for conditioning process gases for the heat treatment of metallic work pieces in industrial furnaces – No. US8747731B2: Issued June 10, 2014.
  • Method for controlling vacuum pumps in an industrial furnace complex – No. US8694167B2: Issued April 8, 2014.
  • Loading system for a heat treating furnace – No. 8US8662888B2: Issued March 4, 2014.
  • Method and device for controlling process gases for heat treatments of metallic materials/workpieces in industrial furnaces – No. US8465603B2: Issued June 18, 2013.
  • Method for conditioning process gases for the heat treatment of metallic work pieces in industrial furnaces – No. US8333852B2: Issued December 18, 2012.
  • Method and device for thermal treatment of metallic materials – No. US8313586B2: Issued November 20, 2012.
  • Method and computer program for controlling the heat treatment of metal workpieces – No. US8280531B2: Issued October 2, 2012.
  • Retort furnace for heat treating metal workpieces – No. US8246901B2: Issued August 21, 2012.
  • Industrial furnaces and device for performing the method and computer program – No. US8175744B2: Issued May 8, 2012.

2000s

  • Method for heat treatment of metal workpieces as well as a heat-treated workpiece – No. US7559995B2: Issued July 14, 2009.
  • Method and device for blacking components – No. US7160576B2: Issued January 9, 2007.
  • Flapper gas nozzle assembly – No. US7105126B2: Issued September 12, 2006.
  • Vacuum compression brazing furnace and method of using same – No. US6910614B2: Issued June 28, 2005.
  • Directional cooling system for vacuum heat treating furnace – No. US6903306B2: Issued June 7, 2005.
  • Method for electrical heating of furnaces for heat treatment of metallic workpieces – No. US6794618B2: Issued September 21, 2004.
  • Convection heating system for vacuum furnaces – No. US6756566B2: Issued June 29, 2004.
  • Cooling gas injection nozzle for a vacuum heat treating furnace – No. US6533991B1: Issued March 18, 2003.
  • Method for heat-treating metallic workpieces – No. US6428742B1: Issued August 6, 2002.
  • Method and use of an apparatus for the thermal treatment, in particular nitriding treatment, of metal workpieces – No. US6328819B1: Issued December 11, 2001.
  • Expansion loops for heating elements in vacuum furnaces – No. US6307874B1: Issued October 23, 2001. 

1990s

  • Heating element support for an electric heat treating furnace – No. US5930285A: Issued July 27, 1999.
  • Diffusion bonding furnace having a novel press arrangement – No. US5883361A: Issued March 16, 1999.
  • Curved graphite heating element for an electric resistance heating furnace – No. US5965050A: Issued October 12, 1999.
  • Heating element support for an electric heat treating furnace – No. US5930285A: Issued July 27, 1999.
  • Method for plasma carburization of metal workpieces – No. US5851314A: Issued December 22, 1998.
  • Device for heat-treating metallic work pieces in a vacuum – No. US5722825A: Issued March 3, 1998.
  • Method and device for controlling the electric current density across a workpiece during heat treatment in a plasma – No. US5717186A: Issued February 10, 1998.
  • Dual seal for a vacuum heat treating furnace – No. US5709544A: Issued January 20, 1998.
  • Hybrid heat treating furnace - No. US5567381A: Issued October 22, 1996.
  • Heat treating furnace with removable floor, adjustable heating element support, and threaded ceramic gas injection nozzle – No. US5502742A: Issued March 26, 1996.
  • Method and apparatus for measuring the oxygen potential of a heat-treatment furnace – No. US5352344A: Issued October 4, 1994.
  • Gas injection nozzle – No. USD346020S: Issued April 12, 1994.
  • Vacuum furnace – No. US5251231A: Issued October 5, 1993.
  • Gas shrouded electrode for a plasma carburizing furnace – No. US5059757A: Issued October 22, 1991.
  • Furnace for the thermal treatment of iron and steel components – No. US4970372A: Issued November 13, 1990.
  • Gas cooling system for processing furnace – No. US4906182A: Issued March 6, 1990.

1980s

  • Method for gaseous carburization of steel – No. US4881982A: Issued November 21, 1989.
  • Two-way vent cap for controlled atmosphere furnace – No. US4770108A: Issued September 13, 1988.
  • Heat-insulated telemetry system for vacuum furnace – No. US4688039A: Issued August 18, 1987.
  • Method and apparatus for heat treating metallic workpieces using a continuous-heating furnace or gravity-discharge furnace – No. US4622006A: Issued November 11, 1986.
  • Heat treating furnace with heating element hangers and radiation shield spacers – No. US4612651A: Issued September 16, 1986.
  • Industrial furnace for the thermal treatment of metal workpieces – No. US4610435A: Issued September 9, 1986.
  • Electric heat treating furnace with quickly serviceable heating assembly components – No. US4608698A: Issued August 26, 1986.
  • Gas nozzle for a heat treating furnace – No. US4560348A: Issued December 24, 1985.
  • Heat treating furnace with graphite heating elements – No. US4559631A: Issued December 17, 1985.
  • Method and apparatus for the control of the carbon level of a gas mixture reacting in a furnace chamber – No. US4372790A: Issued February 8, 1983.
  • Industrial furnaces for the heat treatment of metallic workpieces – No. US4278421A: Issued July 14, 1981.
  • Aluminum soldering furnace – No. US4221561A: Issued September 9, 1980.
  • Continuous heating furnace for the heat treatment of small parts – No. US4205935A: Issued June 3, 1980.
  • Method for the gas carburization of workpieces made of steel – No. US4201600A: Issued May 6, 1980.

1970s

  • Method for control of the carburization of parts in a vacuum furnace – No. US4168186A: Issued September 18, 1979.
  • Loading device – No. US4116324A: Issued September 26, 1978.
  • Method and apparatus for gas circulation in a heat treating furnace – No. US4086050A: Issued April 25, 1978.
  • Radiating tube burner – No. US3855993A: Issued December 24, 1974.
  • Vacuum furnace – No. US3820766A: Issued June 28, 1974.
  • Charging device for charging and emptying the heating chamber of vacuum quenching furnaces – No. US3801079A: Issued April 2, 1974.

1960s

  • Heat treating method and apparatus – No. US3447788A: Issued June 3, 1969.
  • Dew point measuring apparatus – No. US3385098A: Issued May 28, 1968.
  • Condition controlling apparatus, particularly for controlling temperatures – No. US3310656A: Issued March 21, 1967.
  • Method of heat treating high speed steels – No. US3171759A: Issued March 2, 1965.
  • Apparatus for measuring carbon potential – No. US3031881A: Issued May 1, 1962.

Harold Ipsen U.S. Granted Patents: 1960s

  • Heat treating furnace – No. US3399875A: Issued September 3, 1968.
  • Construction of insulated furnace wall – No. US3368802A: Issued February 13, 1968.
  • Loading arrangement for shaker hearth heat treating furnaces – No. US3365182A: Issued January 23, 1968.
  • Heat treating furnace with circulated gas quench – No. US3301541A: Issued January 31, 1967.
  • Conditioning apparatus with tiltable receiving platform – No. US3266644A: Issued August 16, 1966.
  • Conditioning apparatus with work transfer mechanism – No. US3212765A: Issued October 19, 1965.
  • Heat treating apparatus – No. US3204939A: Issued September 7, 1965.
  • Heat treating furnace – No. US3199854A: Issued August 10, 1965.
  • Actuating Mechanism – No. US3196699A: Issued July 27, 1965.
  • Quenching apparatus for metallic articles – No. US3164656A: Issued January 5, 1965.
  • Recirculating heat treating furnace – No. US3163694A: Issued December 29, 1964.
  • Method of evacuating treating chambers – No. US3144199A: Issued August 11, 1964.
  • Conveyor for heat treating furnace – No. US3026099A: Issued March 20, 1962.
  • Combined vacuum valve and cold trap – No. US3019809A: Issued February 6, 1962.

Harold Ipsen U.S. Granted Patents: 1950s

  • Transfer mechanism – No. US2896775A: Issued July 28, 1959.
  • Heat exchanger baffle system - No. US2861596A: Issued November 25, 1958.
  • Quenching apparatus – No. US2854013A: Issued September 30, 1958.
  • Transfer mechanism for conditioning apparatus – No. US2842349A: Issued July 8, 1958.
  • Burner tube assembly for heat treating furnaces – No. US2822798A: Issued February 11, 1958.
  • Method of and apparatus for heat treating metal parts – No. US2815305A: Issued December 3, 1957.
  • Heat treating furnace – No. US2800317A: Issued July 23, 1957.
  • Baffle type heat treating furnace – No. US2788205A: Issued April 9, 1957.
  • Heat treating apparatus – No. US2747855A: Issued May 29, 1956.
  • Ceramic fan construction for heat treating furnaces – No. US2730352A: Issued January 10, 1956.
  • Transfer mechanism – No. US2681136A: Issued June 15, 1954.
  • Muffle furnace – No. US2658744A: Issued November 10, 1953.
  • Conveyor apparatus for heat treating metal parts – No. US2639047A: Issued May 19, 1953.
  • Electric heating apparatus – No. US2637755A: Issued May 5, 1953.
  • Heat-treating furnace – No. US2615701A: Issued October 28, 1952. 

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