Pipeline pig
CA 1160405 A · Owner: Schwartz, Robert E. · Inventors: Utter, Gary N.; Neff, Laurence M.; Schwartz, Robert E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pipeline pig having a shaft of flexible plastic with an enlarged head portion, a plurality of dish members of flexible plastic, a plurality of flexible spacers, the dish member and spacers each having an axial opening therethrough receiving the shaft each, spacer having an integral cup portion at one end two, spacers being received on the shaft in back-to-back relationship between adjacent dish members and a retainer member on the shaft adjacent the rearward end holding the dish members and spacers in engagement with each other, and thereby holding the dish members in spaced apart relationship, the dish members being of an outside diameter configured to closely correspond with the inside …
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 January 17, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 17, 2001.
- 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.