NL6901332A
Expired / Lapsed
NL
⏱️ 0.0 years remaining
Tobacco smoke filter
Assignee: —
•
Filing: 1969-01-28
•
Granted: —
•
Expires: 1989-01-28
Abstract
Abstract With improved tar retention, having a filter mass arranged over the whole cross section of a smoke channel in which a throat is provided in front of the filter mass at the side opposite to the material being smoked, formed from a cylindrical bush terminating shortly before the filter mass, the throat taking the form of a frustroconical surface of 40-80 degrees cone angle, merging at its narrow end into the cylindrical bush, which has a length of at least 2mm and internal diameter of 1.5-2.5mm.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
NL
Data Source
google_patents
Last Synchronized
2026-11-01 17:29
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/12; A24D3/04; A24D3/045
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.