Method and apparatus for variably controlling the speed of a slave drive roller
CA 2087825 C · Owner: Torpey, William A. · Inventors: Ehnot, Raymond A.; Torpey, William A.; Puckhaber, Charles F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus is provided for controlling the speed of a slave drive roller in a coating machine. Speed of the slave drive roller at a second coater is regulated by an adaptive gain allowing greater tolerances when not at run speed. That is, in addition to normal speed correction, the system accommodates greater web speed fluctuation during threadup, acceleration and, deceleration. This accommodation may be based on the sensed position of the float roller or alternatively, on, the sensed rate of acceleration/deceleration of the master drive roller.
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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 21, 1993 and granted January 5, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 21, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 21, 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.