Patent US2780277A successfully refreshed from Google Patents.
Patent DE636892C successfully refreshed from Google Patents.
DE636892C
Expired / Lapsed
DE
⏱️ 0.0 years remaining
Process for heat exchange between gaseous media
Assignee: HEINRICH CHRISTIAN TRUELSEN DI
•
Filing: —
•
Granted: 1937-04-28
•
Expires: 1954-04-28
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-10-23 16:31
CPC Classifications
F; F23; F23L; F23L15/00; F23L15/02; Y; Y02; Y02E; Y02E20/00; Y02E20/34
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.