Patent US4535579A successfully refreshed from Google Patents.
Patent FR871845A successfully refreshed from Google Patents.
FR871845A
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Improvements to contact heat exchangers
Assignee: CONDENSATEURS DELAS SOC D
•
Filing: 1941-04-30
•
Granted: 1942-05-18
•
Expires: 1961-04-30
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-11-07 10:54
CPC Classifications
F; F28; F28F; F28F25/00; F28F25/02; F28F25/08; F28F25/087
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.