Method and device for selective encryption of e-mail
CA 2495034 A1 · Owner: Karamchedu, Murali M. · Inventors: Sponaugle, Jeffrey B.; Machuca, Luis Fernando; Karamchedu, Murali M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system includes a server to store a first portion of a message and a client , to store a complementary second portion of the message. The first portion of the message is encrypted and a message specific token comprising one or more encryption keys used to encrypt the first portion of the message is generated. The second portion of the message stored on the client is subsequently combined with the message-specific token to form a partially secured message at the client. Furthermore, the partially secured message including the message-specific token is delivered from the client to a recipient to facilitate access to both the first and second portions of the message by the recipient.
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. No grant is recorded for it in Canada; had it been granted, its 20-year term would have 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.