Topical anesthetic formulation
CA 2323211 C · Owner: Castillo, James · Inventors: Castillo, James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A topical, transdermal anesthetic formulation comprising a eutectic mixture of, preferably, lidocaine and prilocaine in a ratio of about 3:1 by weight incorporated within a lipophilic base. In addition to the property of rapidonset, the formulation of the present invention has high storage stability and is less restricted by dosage limitations of other prilocaine-containing transdermal anesthetics and is, advantageously not dependent upon occlusive , dressing for optimal transdermal absorption.
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 April 27, 1999 and granted December 23, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 27, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 27, 2021.
- 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.