Fastener assembly useful as drain plug
CA 2086903 C · Owner: Illinois Tool Works Inc. · Inventors: Jones, James D. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fastener assembly comprises a metal screw and a sealing ring made from an elastomeric material and is useful, in an exemplary application as a drain plug, for an oil pan for an internal combustion engine. The screw head has an undercut, annular recess within which, the sealing ring is seated. The sealing ring has a sealing portion, which when unstressed has an axial thickness smaller than the recess depth and an, adjoining portion or web extending radially inwardly. When unstressed the adjoining portion has an inner, diameter smaller than the major diameter of the threaded portion of the screw shank. The sealing ring when unstressed has an outer diameter larger than the outer diameter 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 January 7, 1993 and granted April 21, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 7, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 7, 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.