DE891500C
Expired / Lapsed
DE
⏱️ 0.0 years remaining
Portable respiratory protection device with electrostatic filter for separating solid and liquid particles
Assignee: SFINDEX
•
Filing: 1951-11-18
•
Granted: 1953-09-28
•
Expires: 1971-11-18
Abstract
No abstract record available.
Inventors
- 👤 Friedrich Julius Dipl-Ing Maas
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-10-26 13:52
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/40; B03C3/41; B03C3/43; A; A62; A62B; A62B23/00
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.