Violin bow guide clip
CA 2045000 C · Owner: Knowlton, Richard A. · Inventors: Knowlton, Richard A.; Kraemer, Philipp; Spadafora, Robert J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides an improved clip for use with a violin bow guide. The bow guide is of the type having a rod guide which is supported on a stand above the violin strings, and a rod which slides through a bore in the rod guide, the ends of the rod being attached to the violin bow. A pair of the improved clips is used for attaching the rod to the violin. The clip has a body with a bore for receiving an end of the rod, means to stop the rod from passing through the bore in the body and gripping means to hold the back of the bow. The bore is configured to permit the rod to move up and down therein, and means are provided to selectively restrict such movement.
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 19, 1991 and granted February 1, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 19, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 19, 2013.
- 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.