Clam bucket for use in pipeline padding
CA 2310798 C · Owner: Cronk, Thomas J. Jr. · Inventors: Cronk, Thomas J. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A clam bucket of the present invention has a first and a second bucket halves each bucket half includes a first and a second side wall a bucket back wall, and a bucket, connecting plate. At least a portion of each of the two side walls is made of a side wall, screen. The bucket back wall is rigidly connected between the first and the second side, walls and extends from the bucket top edge to the bucket digging edge. At least a portion, of the bucket back wall is composed of a back wall screen. The side wall and back wall, screens should be positioned so as to allow padding material to pass through the screen, but prohibit the passage of stones through the screen. The bucket connecting …
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
- Filed June 6, 2000 and granted October 2, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 6, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 6, 2022.
- 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.