FR715051A
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Finned tube for heat exchangers
Assignee: Otto Happel
•
Filing: 1931-04-10
•
Granted: 1931-11-25
•
Expires: 1951-04-10
Abstract
No abstract record available.
Inventors
- 👤 Otto Happel
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-11-01 11:07
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/24; F28F1/30
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.