Rotary anti-scaling device
CA 1283317 C · Owner: Francis, Joseph Robert · Inventors: Francis, Joseph Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rotary anti-scaling device comprises a pair of substantially identical halves connected together at a relative displacement of 180° about a central transverse axis through the halves to form a unitary spike. Each half includes a central body portion with a central transversely-extending bore therethrough permitting rotation of the unitary spike on an associated mounting bar, one or more projections extending from opposed ends of each body portion and at least one of the body portions having means formed thereon for co-operating with an adjacent spike to locate said spike in a position displaced angularly about its transverse axis relative thereto.
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 April 23, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 23, 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.