Expired Canadian patentCanada
Polyethylenimine bound chromatographic packing
CA 1213261 A · Owner: Ramsden, Hugh E. · Inventors: Ramsden, Hugh E.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, The reaction product of silica gel or controlled pore glass and polyethyleniminopropyl trimethoxy silane suitable for use as chromatographic column packing.
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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
- Granted October 28, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 28, 2003.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 15, 1984
GrantedOctober 28, 1986
Term endedOctober 28, 2003
Patent numberCA 1213261 A
Classification (IPC)B01J20/32 +1 more
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.