Removable closure device
CA 1296909 C · Owner: Calkins, Dennis Earl · Inventors: Calkins, Dennis Earl; Haney, James Allan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fixed pile guide having a removable ring gate which restrains a pile within the pile guide. When in the closed position, the ring gate is secured to the guide by means of a pivotable arm. To release the pile and/or to convert the guide to an open pile guide a, cable secured to the arm is pulled which pivots the arm thereby releasing the gate from the fixed guide as well as releasing restraint on the pile.
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 March 10, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 10, 2009.
- 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.