Apparatus and method for applying plasticizers to fibrous filter material
CA 1192393 A · Owner: Brown & Williamson Tobacco Corporation · Inventors: Lewis, Robert T.; Sullivan, James W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A filter rod making machine is provided with an apparatus for applying plasticizer to a band of fibrous filter material wherein the application rate of the plasticizer is independent of the filter tow weight or width of the band passing through the apparatus. The plasticizer is added to the underside of the moving band by means of a rotatively mounted brush in rotating communication with a plasticizer supply source wherein the amount of plasticizer added to the band is dependent upon the amount of plasticizer metered by a constant volume pump. The rotatively mounted brush delivers liquid plasticizer in the form of a spray to the underside of the moving band. Variable changes in the level 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
- Granted August 27, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 27, 2002.
- 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.