Patent US5544040A successfully refreshed from Google Patents.
Patent DE642983C successfully refreshed from Google Patents.
DE642983C
Expired / Lapsed
DE
⏱️ 0.0 years remaining
Boost filter
Assignee: MELITTA WERKE AKT GES
•
Filing: —
•
Granted: 1937-03-20
•
Expires: 1954-03-20
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-10-28 09:23
CPC Classifications
A; A47; A47J; A47J31/00; A47J31/44; A47J31/4403; A47J31/446
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.