Cigarette filters and method of manufacturing same
CA 1208098 A · Owner: Vyskumny Ustav Chemickych Vlaken · Inventors: Peciar, Jozef; Badura, Jan; Mitterpach, Ivan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Cigarette filter rods with improved efficiency and reduced resistance to gas flow consist of polypropylene multi-component fibres with micro-fissures on the surface and micropores in the mass, having from 5 to 7 crimps per 1 cm length and a fineness of from 5 to 7 dtex. The elementary fibres in the bundle have different centres of gravity and the ratio of the component weight is 1:3 to 3:1. The process is based on separate melting and thermal treatment of each polypropylene melt flow with LVI of 100 to 200 ml.g-1 at the temperature of from 230 to 330°C so that a difference in the LVI value is 30 to 50 ml.g-1; at least one of the components contains from 5 to 20% by weight of a high …
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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 July 22, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 22, 2003.
- 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.