Expired Canadian patentCanada
Method of forming a filled polymer coating on an internal cylindrical surface and article produced thereby
CA 1104883 A · Owner: American Cast Iron Pipe Company · Inventors: Snow, William E.; Phelps, Edwin H.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A filled, low or medium density poly-, ethylene or other polyolefin composition is used to form a polymer coating on an internal cylindrical metal surface such as, for example the interior, surface of a pipe.
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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 July 14, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 14, 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.
FiledMarch 30, 1978
GrantedJuly 14, 1981
Term endedJuly 14, 1998
Patent numberCA 1104883 A
Classification (IPC)B05D3/00 +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.