Generating inorganic polymer electret in colloidal state
CA 2293420 A1 · Owner: Holcomb, Robert R. · Inventors: Holcomb, Robert R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An inorganic polymer electret in a colloidal state for example silica, is , generated by utilizing a magnetic field gradient through which the materials are passed. Referring to Figure 7, materials (5) aqueous sodium silicate and , NaOH plus tripotassium citrate are pumped from container (3) by pump (1) in conduit (2) through conduit (6) into conduit (7) out through holes (8) into , conduit (13) out through holes (9) into conduit (14) out through holes (10) whereby the material reverses direction twice and then enters into conduit , (15) and chamber (11) in order and finally is carried back to container (3) through conduit (4). Magnetic booster units (A) (B) and (C) shown in Figure 8 , …
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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
- Filed June 5, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 5, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 5, 2020.
- 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
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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.