Chalk line reel
CA 2199193 C · Owner: Chervenak, Thomas M. · Inventors: Chervenak, Thomas M.; Beckmann, Toby J.; Sorensen, Joseph A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A chalk line reel includes an opening in the housing that permits access to a powdered chalk storage area. A movable door is mounted on the housing and the door is, movable to a closed position in which the door obstructs the opening. A first element on the door releasably couples the chalk line clip to the door, and a second element on the housing releasably couples the chalk line clip to the housing. The first and second elements are positioned such that clip resists movement of the door away from the closed position when the clip is coupled to the first and second elements.
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 March 5, 1997 and granted October 24, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 5, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 5, 2019.
- 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.