Fluid-flow controlling device and apparatus employing same
CA 1284073 C · Owner: Ferri, Joseph E. · Inventors: Ferri, Joseph E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A non-mechanical valve and/or filter device which is suitable for use in an apparatus for aspirating body fluids and which comprises a water insoluble water-absorbent, material which, upon contact with water becomes substan-, tially impervious to flow through it of gas and liquid in the wetted regions thereof, the preferred form of said device being a porous rigid structure of sintered particles of polyethylene and said water-absorbent material.
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 14, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 14, 2008.
- 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.