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US 5,664,586 AGranted
Tobacco smoke filters and filter rods therefor
AssigneeRothmans International Services Limited
InventorsNeil Murray Sinclair, Robert Kinsey Dart
Life of this patent
Estimating the term…
Abstract
The invention provides a cigarette filter (1) the biodegradation of the material (3) which is assisted by the incorporation of swellable means in the filter so that upon exposure to moisture the volume of the filter is increased, preferably to the extent of breaking open a filter wrap (2) which enclosed it.
Claims9
A tobacco smoke filter or filter rod therefor (hereinafter "filter") comprising a main body portion;
- expandable means for expanding the main body portion when the expandable means becomes moist, and wrap means for wrapping the main body portion, the expansion of the main body portion being such as to break open the wrap means.
Dependencies are inferred from the claim text.