The text and illustrations of US patents published before March 1, 1989 are in the public domain unless the patent text contains a specific notice that portions are copyrighted. See 37 CFR 1.71(d), 37 CFR 1.84(s) The original patent contains no such notice, so its contents are in the public domain. Note: This only applies to images published before March 1, 1989. Patents published after that date are most likely copyrighted, unless in the public domain for another reason, such as {{PD-ineligible}}.

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• 2010-01-30 22:40 AndreAdrian 859×668× (13403 bytes) {{Information |Beschreibung = Colpitts Oszillator Patentschrift Fig. 2 |Quelle = US Patent 1624537 |Urheber = E. H. Colpitts |Datum = 1.Feb.1918 |Genehmigung = {{Bild-PD-Amtliches Werk}} |Andere Versionen = |Anmerkungen = }}