Cellulose esters having near infrared fluorophores and method of making same
CA 2340532 A1 · Owner: Partin, Lee Reynolds · Inventors: Partin, Lee Reynolds; Krutak, James John Sr.; Boyd, Edwin Taylor
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cellulosic ester has associated with the ester at least one near infrared fluorophore. A method, for incorporating the near infrared fluorophore into the cellulosic ester is also provided. In the, method, the near infrared fluorophore is dissolved in a strong acid and precipitated to form an, acid paste. The paste is then added to an activated cellulose such as a , hydrolyzed cellulose, acetate in the presence of at least one acid and acid anhydride. Advantageously, such marked, cellulosic materials can be solvent spun into staple fibers which may be further utilized in known, materials, webs and articles.
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 March 13, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 13, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 13, 2023.
- 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.