125 years of expertise in industrial furnace construction

High quality engineering

From craftsmanship to industrial engineering

The revolution of engineering

1896 - in this year the very first resistance-heated high-temperature furnace was designed and built together with Professor Gustav Tammann and the later Nobel Prize winner in chemistry Professor Walther Nernst. Just two years later, Ruhstrat received orders for the industrial production of high-temperature furnaces that reached a temperature limit of up to 3,300°C. 

Since then, we have been developing and manufacturing customized high-temperature industrial furnaces, which are used for the heat treatment of a wide range of materials and are of interest to various industries. 

Come with us on a time travel through our technological revolution....

1894

Development of the adjustable sliding resistor together with Prof. Walther Nernst

1896

Construction of the first resistance-heated high-temperature furnace with Prof. Walther Nernst and Prof. Gustav Tammann

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1898

Start of construction of high-temperature furnaces for industrial purposes as "Elektromechanische Werkstätten Gebr. Ruhstrat"

1903

Patenting "Improvements in Electric Furnaces" and invention of the electric melting furnace according to Prof. Nernst

1926

Production of the electric high-temperature furnaces "Tammann furnaces" with a temperature limit up to 3,300°C.

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1930

Construction of the crystal pulling furnace and pull-through furnace for bright hardening of strip steels

1941

Patenting of the furnace door

1950

Production and distribution of coffee roasters

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1951-1952

Invention of the enamel oven, vacuum oven and oven with pull-out hearth

1953

Patent "Method and apparatus for cleaning coal".

1983

Development of the first carbonization furnace

1989

Invention of the rotary kiln

Rotary Kiln ONEJOON 890x480

2001

Construction of the tube furnace with a combustion tube and a screw conveyor

2003

Patent for cooling device for flat strips of metal

2004

Patenting of the method and apparatus for annealing flat strips

2005

Electric heating element from a flat heating band

2007

Fabrication of the muffle furnace

2008

Construction of furnaces for pyrolysis and for the production of photovoltaic thin-film cells

2015

Patent "Method, furnace device and plant for mold hardening of workpieces"

2018

Successful completion of a large battery material project in Asia by Eisenmann Thermal Solutions and ONEJOON

You want to know more about our origin and developments?

Take a look at the following pages and experience our company up close. Enjoy your personal journey into ONEJOON's past.

We celebrate our anniversary!

125 years of expertise in industrial furnace construction read more

Our company history

From small electrical store to global player read more

Impressive personalities

From founders to Nobel laureates read more
We celebrate our anniversary!

125 years of expertise in industrial furnace construction

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