Cigarettes
CA 1195898 A · Owner: Brown & Williamson Tobacco Corporation · Inventors: Maclean, Kenneth J.H.; Ward, Michael J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cigarette having a cigarette rod enwrapped in a cigarette wrapper and a filter tip attached at one end of the rod by a tipping wrapper. The filter tip has at its periphery one or more grooves extending to the mouth end of the tip. The cigarette wrapper at the region of the rod adjacent the tip is depressed inwardly to form a cavity communicating with the groove or grooves, and the portion of the tipping wrapper overlying the cavity permits ingress of air into the cavity. This permits air to enter the smoker's mouth through the groove or grooves and reduces or avoids problems of the smoker obturating the air inlet when holding the cigarette at the tip end.
Read the whole patent
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 October 29, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 29, 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.