Tool and tool holder for hand-tool apparatus
CA 2100488 C · Owner: Lange, Wolfgang · Inventors: Lange, Wolfgang; Schulz, Reinhard; Meinke, Holger
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The tool for a tool holder of hand tools used for chiselling and/or percussion drilling has a chucking shank. This chucking shank is provided with two rotary driving grooves which are located diametrically opposite one another and open axially toward the free end of the chucking shank. Also, the chucking shank has two diametrically opposite, axially closed locking grooves. In order to increase the total working surface decisive for the transmission of torque, two longitudinal grooves are provided which are likewise arranged diametrically opposite one another and open axially toward the free end of the chucking shank. The length of these longitudinal grooves exceeds the length of the locking …
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 July 14, 1993 and granted January 4, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 14, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 14, 2015.
- 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.