Improvements in and relating to gaskets
CA 2116129 C · Owner: Stephan, Walter M. · Inventors: Stephan, Walter M.; Allen, Kurt
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A spiral wound gasket comprises an annulus constituted by a plurality of superposed turns (12, 13) of a profiled metal strip wound upon itself to form a spiral and, interposed between at least some of said superposed turns a number of turns of a relatively soft sealant material (11) in strip form the, width of said material strip (12, 13) being selected so that prior to use the wound metal spiral is essentially flush with the surface of an associated guide, ring (16) and the width of the strip of relatively soft sealant material (11) be-, ing selected so that prior to use it projects a significant distance on both sides, of the gasket from said superposed metal turns (12 13) axially of …
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 September 29, 1992 and granted June 18, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 29, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 29, 2014.
- 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.