CH307257A
Expired / Lapsed
CH
⏱️ 0.0 years remaining
Device to prevent air exchange between two rooms.
Assignee: Schneider Eugen
•
Filing: 1952-12-08
•
Granted: —
•
Expires: 1972-12-08
Abstract
No abstract record available.
Inventors
- 👤 Schneider Eugen
Bibliographic Details
Application Number
—
Jurisdiction
CH
Data Source
google_patents
Last Synchronized
2026-10-22 21:05
CPC Classifications
F; F24; F24F; F24F9/00
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.