Transmitting revisions with digital signatures
CA 2282479 A1 · Owner: Koninklijke Philips Electronics N.V. · Inventors: Epstein, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a computer network, documents are produced the document is hashed to , produce a fingerprint and the fingerprint is encrypted to sign the document then the document signature is transmitted from the user system to a secure computer system. The secure computer system creates a time stamp including the document signature and a digital time. The secure system signs the time stamp to verify its origin. The time stamp and notary's signature are transmitted from the secure system to the user's system. The user has access to the notary's public key which is used to determine whether the time stamp is authentic. Then the document is revised the revised document is hashed and , the hash is …
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 December 28, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 28, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 28, 2020.
- 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.