Stefan Kiefer has been granted 8 US patents while listed as an inventor at Amazon . The first was granted in 2001 and the most recent in June 2025. Stefan Kiefer ranks #600,572 of 4,157,543 US inventors in our database (top 14.4%). Patent records list Stefan Kiefer in Osnabrück, DE.
Patents per Year Patents granted per year, 2001 to 2025 Bar chart with a peak of 2 patents in 2024. peak 2 2001: 1 patents 2001 2010: 1 patents 2010 2011: 1 patents 2011 2012: 1 patents 2012 2016: 1 patents 2016 2024: 2 patents 2024 2025: 1 patents 2025
Issued Patents All Time
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Showing 1–8 of 8 patents
Patent # Title Co-Inventors Date Approx Value ⓘ
12329054 Method of spreading granular material Timo Klemann 2025-06-17
12161108 Agricultural spraying device Timo Klemann 2024-12-10
12004505 Agricultural distribution device Volker Ehlen , Stefan Jan Johannaber , Christian Holtkötter , Timo Klemann , Florenz HILBERT 2024-06-11
9400998 Consistent interface for message-based communication arrangement, organisational centre replication request, and payment schedule Leif Albers , Jan Brink , Mario Mueller , Johannes Bechtold , Herbert Boche +14 more 2016-07-26
$2,281,000
8229937 Automatic creation and transmission of data originating from enterprise information systems as audio podcasts Amrish Singh 2012-07-24
$2,528,000
8027885 Complex prices in bidding Antonia Gross , Andreas Koenig , Michael Buehler 2011-09-27
$1,936,000
7853482 Complex prices in bidding Antonia Gross , Andreas Koenig , Michael Buehler 2010-12-14
$775,000
6200270 Sensor for non-invasive and continuous determination of the duration of arterial pulse waves Margit Biehl 2001-03-13
