Hub for information media
CA 2112654 C · Owner: Thiele, Hartmut · Inventors: Thiele, Hartmut; Toral, Jose; Liepold, August
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hub, on which compressing of the, inner central bore is to be minimized during the winding up of an information medium in tape form under high winding pressure. According to one embodiment this is achieved by an outer hub, ring having a strong profile being provided alongside the outer windung area and by there also being elastically deformable intermediate elements between outer hub ring and inner hub ring. Such elements provide for a compression ratio of the compressed diameters of a the inner to the outer ring of less than 1:4. In the case of a further embodiment, variously shaped openings or notches, which are distributed evenly over the entire circumference, are provided on both …
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 December 30, 1993 and granted February 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 30, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 30, 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.