← Back to Patent Explorer
EP0346648A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Process for impregnating the fibres of a tobacco smoke filter with di- or polycarboxylic acids or their anhydrides

Assignee: British American Tobacco Germany GmbH
•
Filing: 1989-05-22
•
Granted: —
•
Expires: 2009-05-22
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract Translated from German Mit Di- oder Polycarbonsäuren bzw. Anhydriden derselben imprägnierte Fasern von Tabakrauchfiltern können erhalten werden, indem man Anhydride von Di- oder Polycarbonsäuren in flüchtigen oder physiologisch unbedenklichen organischen Lösemitteln löst und auf die Fasern aufbringt sowie gegebe­nenfalls mit Wasser hydrolysiert. Fibers of tobacco smoke filters impregnated with di- or polycarboxylic acids or anhydrides thereof can be obtained by dissolving anhydrides of di- or polycarboxylic acids in volatile or physiologically harmless organic solvents and applying them to the fibers and, if appropriate, hydrolyzing them with water.

Inventors

  • 👤 Paul-Georg Dr. Henning
  • 👤 Gerald Schmekel

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-28 16:09
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/14

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.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag