Process for pure cefamandole free acid from salts thereof
CA 1100945 A · Owner: Eli Lilly And Company · Inventors: Chou, Ta-Sen; Zintgraff, Gary D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Passing a solution buffered to a pH of from about, 3.5 to about 4.5 of an alkali metal or ammonium salt of cefamandole through a bed of an adsorbent resin depending on van der Waals forces for adsorption followed by acidification to a pH of about 2.0 With a non-oxidizing inorganic acid yields pure crystalline cefamandole, which can be separated and dried, or partitioned into n preferential solvent from which crystalline sodium cefamandole can be recovered.
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
- Granted May 12, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 12, 1998.
- 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.