From: Hal <hfinney@shell.portal.com>
Date: Tue, 10 Oct 95 09:39:02 PDT
To: cypherpunks@toad.com
Subject: Re: Chaum's patents
In-Reply-To: <Pine.3.89.9510091650.A96856-0100000@aix2.uottawa.ca>
Message-ID: <199510101637.JAA22634@jobe.shell.portal.com>
MIME-Version: 1.0
Content-Type: text/plain


s1018954@aix2.uottawa.ca writes:

>Sorry if this has been stated before, but exactly when do Chaum's first
>set up e-cash related patents expire? I looked it up in applied crypto
>the last time I had my hands on it and couldn't find the dates. 

>How many (and what) patents are there in this field anyway? (don't bother 
>with that if it's too long to answer)

I did a patent search a few months ago, with results at <URL:
http://www.portal.com/~hfinney/chaum_patents.html>.  Chaum has several
patents; my lists doesn't have all of them.  The ones I have are dated
1988 and 1990.

Hal