A roll assembly for use at high temperature and method of making same
CA 2297917 A1 · Owner: Hawk, Stewart P. · Inventors: Mehnert, Warren L.; Rogers, John C.; Hawk, Stewart P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A roll assembly (20) for high temperature applications comprising a roll body (22) and trunnions (30) on opposing ends (24) thereof is disclosed. The roll body and supporting trunnions are comprised of alloys having dissimilar coefficients of linear thermal expansion. The trunnions are attached to the roll body so that there is a predetermined gap (40) at room temperature that decreases or closes at a desired operating temperature. The gap decreases due to the dissimilar thermal expansions between the roll body and the trunnions. In certain embodiments, the distance of the gap is determined so there is a tight predetermined interference fit between the trunnions and the roll body …
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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 September 21, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 21, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 21, 2020.
- 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.