Hydrated silica and purification of dna
CA 2089119 C · Owner: Down, James A. · Inventors: Howard, Adriann J.; Woodard, Daniel L.; Down, James A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention discloses hydrated celite how to make, hydrated celite, and processes for purifying DNA with hydrated celite. The new composition is of the formula: (see formula I), wherein R' is OH, R is SiO2 and R'' is OH, and repeating, units of the composition comprising the formula: (see formula II), wherein R' is independently OH or (see formula III) R is SiO2, and R'' is independently OH or (see formula IV).
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 February 9, 1993 and granted December 26, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 9, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 9, 2015.
- 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.