Method and apparatus for secure e-mail
CA 2495018 C · Owner: Karamchedu, Murali M. · Inventors: Sponaugle, Jeffrey B.; Karamchedu, Murali M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An enterprise-based system includes a storage server equipped to generate a split encryption key having at least a first key portion and a second key portion, that is used by the storage server to encrypt at least a portion of a message. Additionally, the first key portion of the split encryption key is retained by the storage server, while the second key portion of the split encryption key is delivered to a message routing server and is discarded from the storage server. The message routing server in turn provides the second key portion to one or more recipients of the message to facilitate recipient access to the message.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed August 6, 2003 and granted June 18, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 6, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 6, 2025.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.