Duralumin, Its Properties and Uses Page: 4 of 22
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N.A.C.A. Technical Memorandrm No 284
(entralstelle fir wissenschaftlich-technische Untersuchungen) for
... scientific, r esearch in Neubabelsberg near Berlin, in which the in-
ventor, Alfred 'ilm, was the superintendent of the metallurgical
In 1903 the task was given to this institute by one of its
founders, the German War Mu.nition Factories of Berlin and Karlsruhe,
to find an aluminum alloy suitable for making cartridge cases for
hand firearms. The discovery of duralumin was announced in 1909
and was patented in 1912 under the number DRPp244554. To what ex-
tent duralumin satisfied the requirements will be explained later.
On the retirement of Professor Stribeck from the directorship
of the institute in 1909, the metallurgical section was discontin-
ued. Engineer Alfred Wilm took over all existing patent rights
and the Duren Metal Works obtained, as the successor of the German
War Munition Factories, the manufacturing rights, under the patent
DRP244554, for Germany, Scandinavia, Holland, Belgium and Switzer-
The patent, D,:.R.P.244554, reads: "A process for making alumi-
num alloys containing magnesium, characterized by the fact that
the alloys, after the last heating in the course of manufacture,
are exposed to temperatures above 4200 (788F) and then left for
.some time to automatic improvement." In the description it is
stated that the alloys, after being heated, should be allowed to
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Beck, R. Duralumin, Its Properties and Uses, report, October 1924; (digital.library.unt.edu/ark:/67531/metadc58745/m1/4/: accessed January 20, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.