David Chaum — 33 Patents at Info Space

David Chaum has been granted 33 US patents while listed as an inventor at Info Space. The first was granted in 1985 and the most recent in August 2022. David Chaum ranks #105,480 of 4,157,543 US inventors in our database (top 2.5%). Patent records list David Chaum in West Hollywood, CA, US.

Issued Patents All Time

Showing 1–25 of 33 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
11403903	Random sample elections	—	2022-08-02
11184338	Precomputed and transactional mixing	—	2021-11-23
10536670	Video copy prevention systems with interaction and compression	—	2020-01-14
10375042	Precomputed and transactional mixing	—	2019-08-06
10050786	Random sample elections	—	2018-08-14
8162215	Scan-integrity election systems	—	2012-04-24
8123114	Hidden-code voting and marking systems	—	2012-02-28
7516891	Ballot integrity systems	—	2009-04-14
7210617	Secret-ballot systems with voter-verifiable integrity	—	2007-05-01
6718314	Multi-purpose transaction card system	Niels T. Ferguson, Jelte Willem Jan Van Der Hoek	2004-04-06	$21,380,000
6434238	Multi-purpose transaction card system	Niels T. Ferguson, Jelte Willem Jan Van Der Hoek	2002-08-13	$4,104,000
6318137	Electronic lock that can learn to recognize any ordinary key	—	2001-11-20
6035380	Integrated circuit	Christopher Shelton, Martin Kelly, William E. Orme, Marius Paul Michiel Schilder, Niels T. Ferguson +3 more	2000-03-07
5956400	Partitioned information storage systems with controlled retrieval	Niels T. Ferguson, Berry Schoenmakers, Erik Voskuil	1999-09-21
5878140	Limited-traceability systems	—	1999-03-02
5781631	Limited-traceability systems	—	1998-07-14
5712913	Limited-traceability systems	—	1998-01-27
5493614	Private signature and proof systems	—	1996-02-20
5485520	Automatic real-time highway toll collection from moving vehicles	Peter L. Hendrick	1996-01-16	$1,258,000
5434919	Compact endorsement signature systems	—	1995-07-18
5373558	Desinated-confirmer signature systems	—	1994-12-13
5276736	Optionally moderated transaction systems	—	1994-01-04
5131039	Optionally moderated transaction systems	—	1992-07-14
4996711	Selected-exponent signature systems	—	1991-02-26
4991210	Unpredictable blind signature systems	—	1991-02-05

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David Chaum — 33 Patents

Issued Patents All Time

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