CH237341A
Expired / Lapsed
CH
⏱️ 0.0 years remaining
Ventilation system for air raid shelters.
Assignee: Heinrich Dr Draeger Otto
•
Filing: 1943-11-20
•
Granted: —
•
Expires: 1963-11-20
Abstract
No abstract record available.
Inventors
- 👤 Heinrich Dr Draeger Otto
Bibliographic Details
Application Number
—
Jurisdiction
CH
Data Source
google_patents
Last Synchronized
2026-10-29 18:33
CPC Classifications
A; A62; A62B; A62B13/00
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.