Electroforming mandrel and method of fabricating and using same
CA 2021848 C · Owner: Xerox Corporation · Inventors: Schmitt, Peter J.; Herbert, William G.; Langlois, Edouard E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cylindrical electroforming mandrel and method of fabricating and using same, the mandrel having a substantially cylindrical mandrel core having substantially parallel sides and at least one tapered end having curved sides which converge toward an apex and a plated metal coating on, the parallel sides and the tapered end the profile of an axial cross section, of the tapered end from the intersection between the curved sides and the parallel sides to about the apex having the shape of half an ellipse defined by the formula:, y = ~ b/a~(a2-x2), where: a = 1/2 the length of the major axis of the ellipse and has a value between about 2.3b and about 1.7b, b = 1/2 the height of the minor axis of …
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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 24, 1990 and granted October 21, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 24, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 24, 2012.
- 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.