I believe the two critical ones are (with exp dates): 4759064 Blind unanticipated signature systems (19 Jul 2005) 4759063 Blind signature systems (19 Jul 2005) I can't seem to find a database with who currently owns a patent. I suspect it doesn't exist, which is unfortunate, since it is we the people who have given the monopoly on this idea, but we can't find out *who* has that monopoly. myers On Wed, 2002-10-30 at 14:39, John.Winter@USPTO.GOV wrote:

FYI A list of patents that reference digicash

US 5999625 A USPAT Bellare, Mihir et al. US 6205435 B1 USPAT Biffar, Peter US 6047269 A USPAT Biffar, Peter US 5903880 A USPAT Biffar, Peter C. US 5870473 A USPAT Boesch, Brian Paul et al. US 5878140 A USPAT Chaum, David US 5781631 A USPAT Chaum, David US 5712913 A USPAT Chaum, David US 5956400 A USPAT Chaum, David et al. US 5485520 A USPAT Chaum, David et al. US 5796841 A USPAT Cordery, Robert A. et al. US 6282522 B1 USPAT Davis, Virgil M. et al. US 6021399 A USPAT Demers, Alan J. et al. US 5952638 A USPAT Demers, Alan J. et al. US 5857023 A USPAT Demers, Alan J. et al. US 6138107 A USPAT Elgamal, Taher US 5671279 A USPAT Elgamal, Taher US 6378075 B1 USPAT Goldstein, Theodore C. et al. US 6308270 B1 USPAT Guthery, Scott B. US 6341353 B1 USPAT Herman, Gary et al. US 6370543 B2 USPAT Hoffert, Eric M. et al. US 6282549 B1 USPAT Hoffert, Eric M. et al. US 5983176 A USPAT Hoffert, Eric M. et al. US 5903892 A USPAT Hoffert, Eric M. et al. US 5768391 A USPAT Ichikawa, Bryan K. US 6446052 B1 USPAT Juels, Ari US 5729594 A USPAT Klingman, Edwin E. US 5839119 A USPAT Krsul, Ivan V. et al. US 5848161 A USPAT Luneau, Greg et al. US 6119229 A USPAT Martinez, Ronald et al. US 6157966 A USPAT Montgomery, Michael A. et al. US 6341351 B1 USPAT Muralidhran, N. et al. US 5952639 A USPAT Ohki, Masayuki et al. US 6314409 B1 USPAT Schneck, Paul B. et al. US 5933498 A USPAT Schneck, Paul B. et al. US 5903721 A USPAT Sixtus, Timothy US 5999967 A USPAT Sundsted, Todd US 6467685 B1 USPAT Teicher, Mordechai US 6119946 A USPAT Teicher, Mordechai US 5815665 A USPAT Teper, Jeffrey A. et al. US 6415271 B1 USPAT Turk, James J. et al. US 5983207 A USPAT Turk, James J. et al. US 6272536 B1 USPAT van Hoff, Arthur A et al. US 5919247 A USPAT Van Hoff, Arthur et al. US 6267292 B1 USPAT Walker, Jay S. et al. US 6263505 B1 USPAT Walker, Jay S. et al. US 5949875 A USPAT Walker, Jay S. et al. US 5949044 A USPAT Walker, Jay S. et al. US 5956699 A USPAT Wong, Jacob Y. et al. US 5937394 A USPAT Wong, Jacob Y. et al. US 5913203 A USPAT Wong, Jacob Y. et al.

/john

-----Original Message----- From: myers@maski.org [mailto:myers@maski.org] Sent: Wednesday, October 30, 2002 1:33 PM To: cypherpunks@lne.com Subject: E-C Logix: current patent holder for the DigiCash patents?

While poking around the net today I think I might have come across the new holders of the DigiCash patents, or at least a licensee. As far as I find other sources about who owns the patents it went from DigiCash -> eCash Technologies -> InfoSpace I have not found evidence to link these people from InfoSpace.

You can find it at http://www.e-clogix.com/ , but prepare to use "view source" quite a bit if you aren't using IE.

Some points of interest: http://www.e-clogix.com/about.html This appears to be a venture of a Todd Stinson in Lincoln, Nebraska (you gotta love the photoshop hacked logo on the picture of the building). The email crystal@e-clogix.com bounced, and I have not attempted to call them.

A response an editorial on ecash in Barron's published April 23, 2001 (if anyone has the original please let me know) http://www.e-clogix.com/editorials/barrons_rebuttal.html

Interesting links that are 404: Demo site: http://www.e-clogix.com/Bank/index.html

Anyone know anyone involved in this?

myers