Vibration control apparatus and method for calender rolls and the like
CA 2295764 A1 · Owner: Hildebrand, Stephen F. · Inventors: Quinn, John J.; Hildebrand, Stephen F.; Norris, Mark A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A vibration control apparatus (20, etc.) and method for a calender (18 etc.) , for controlling vibration between two or more rolls (ex. 22 24, etc.) which , controls vibration induced thickness variations in a medium (27) exiting from the nip. The apparatus (20, etc.) includes a frame (19 etc.), a first and , second rolls (22, 24 etc.) mounted relative to the frame, and a force generator (32, etc.), such as an electro-mechanical active actuator servo-, hydraulic actuator, controllable semi-active damper Active Vibration Absorber , (AVA), or Adaptive Tuned Vibration Absorber (ATVA) provides cancelling forces , to control vibration between the first and second roll (22 24, etc.) thereby, …
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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 14, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 14, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 14, 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.